{"id":49480,"date":"2022-12-02T10:02:48","date_gmt":"2022-12-02T10:02:48","guid":{"rendered":"https:\/\/dev.metos.global\/?page_id=49480"},"modified":"2026-05-04T09:39:27","modified_gmt":"2026-05-04T09:39:27","slug":"disease-models-corn","status":"publish","type":"page","link":"https:\/\/metos.global\/ro\/disease-models-corn\/","title":{"rendered":"Modele de boli - porumb"},"content":{"rendered":"<div data-elementor-type=\"wp-page\" data-elementor-id=\"49480\" class=\"elementor elementor-49480\" data-elementor-post-type=\"page\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-17272d3 elementor-section-full_width elementor-section-height-default elementor-section-height-default\" data-id=\"17272d3\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-no\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-3ff3a9c\" data-id=\"3ff3a9c\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-8d546b4 elementor-widget elementor-widget-image\" data-id=\"8d546b4\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"1920\" height=\"350\" src=\"https:\/\/metos.global\/wp-content\/uploads\/2022\/12\/Disease-Models-corn.png\" class=\"attachment-full size-full wp-image-49487\" alt=\"Modele de boli - porumb\" srcset=\"https:\/\/metos.global\/wp-content\/uploads\/2022\/12\/Disease-Models-corn.png 1920w, https:\/\/metos.global\/wp-content\/uploads\/2022\/12\/Disease-Models-corn-300x55.png 300w, https:\/\/metos.global\/wp-content\/uploads\/2022\/12\/Disease-Models-corn-1024x187.png 1024w, https:\/\/metos.global\/wp-content\/uploads\/2022\/12\/Disease-Models-corn-768x140.png 768w, https:\/\/metos.global\/wp-content\/uploads\/2022\/12\/Disease-Models-corn-1536x280.png 1536w, https:\/\/metos.global\/wp-content\/uploads\/2022\/12\/Disease-Models-corn-18x3.png 18w\" sizes=\"(max-width: 1920px) 100vw, 1920px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-3a204ba elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"3a204ba\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-c5ca333\" data-id=\"c5ca333\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-25a817b elementor-widget elementor-widget-heading\" data-id=\"25a817b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\"><b>Porumb <\/b>modele de boli\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-8c7ad64 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"8c7ad64\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-33 elementor-top-column elementor-element elementor-element-92eff2e\" data-id=\"92eff2e\" data-element_type=\"column\" data-e-type=\"column\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-fc6549c elementor-widget elementor-widget-heading\" data-id=\"fc6549c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\"><a href=\"#corn-leaf-blight\">CORN<\/br>LUMINA FRUNZELOR<\/a><\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-33 elementor-top-column elementor-element elementor-element-5b6d986\" data-id=\"5b6d986\" data-element_type=\"column\" data-e-type=\"column\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-b4c9882 elementor-widget elementor-widget-heading\" data-id=\"b4c9882\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\"><a href=\"#corn-fusarium-ear-rot\">PUTREGAIUL FUSARIUM AL URECHII -<\/br><em>Fusarium spp.<\/em><\/a><\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-33 elementor-top-column elementor-element elementor-element-cfd4644\" data-id=\"cfd4644\" data-element_type=\"column\" data-e-type=\"column\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-699d622 elementor-widget elementor-widget-heading\" data-id=\"699d622\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\"><a href=\"#corn-gray-leaf-spot\">PATA DE FRUNZE GRI -<\/br><em>Cercospora zea maydis<\/em><\/a><\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-b98a994 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"b98a994\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-e67d525\" data-id=\"e67d525\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-6b08f06 elementor-align-center elementor-widget elementor-widget-button\" data-id=\"6b08f06\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-md\" href=\"#recommended-equipment\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Echipament recomandat<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-7a9607f elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"7a9607f\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-52868f8\" data-id=\"52868f8\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-9b33216 elementor-widget-divider--view-line elementor-widget elementor-widget-divider\" data-id=\"9b33216\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"divider.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-divider\">\n\t\t\t<span class=\"elementor-divider-separator\">\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-f76a550 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"f76a550\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-b128335\" data-id=\"b128335\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-fdd5717 elementor-widget elementor-widget-menu-anchor\" data-id=\"fdd5717\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"menu-anchor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-menu-anchor\" id=\"corn-leaf-blight\"><\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-fbee676 elementor-widget elementor-widget-heading\" data-id=\"fbee676\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Bacteria frunzelor de porumb<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c64caa1 elementor-widget elementor-widget-text-editor\" data-id=\"c64caa1\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Dou\u0103 boli sunt rezumate sub denumirea de\u00a0<strong>Bacteria frunzelor de porumb<\/strong>. \u00cen climatul moderat \u0219i r\u0103coros vom g\u0103si\u00a0<strong>B\u0103\u0219icu\u021ba frunzelor de porumb din nord<\/strong>\u00a0cauzate de boal\u0103\u00a0<em>Helminthosporium turcicum<\/em>. \u00cen timp ce \u00een climatul mai cald am putea g\u0103si\u00a0<strong>B\u0103\u0219icu\u021ba sudic\u0103 a frunzelor de porumb<\/strong>\u00a0cauzat\u0103 de agentul patogen\u00a0<em>Bipolaris maydis<\/em>\u00a0(Nisikado &amp; Miyake) Shoemaker, teleomorf\u0103\u00a0<em>Cochliobolus heterostrophus<\/em> (Drechs.) Drechs. Aceast\u0103 boal\u0103 a devenit faimoas\u0103 c\u00e2nd a dus la pierderi foarte mari \u00een anul 1970, c\u00e2nd un climat de var\u0103 foarte cald, combinat cu un genom parental foarte reu\u0219it, s-a r\u0103sp\u00e2ndit \u00een porumbul cultivat \u00een SUA \u00een acea perioad\u0103.<\/p><h3>B\u0103\u0219icu\u021ba sudic\u0103 a frunzelor de porumb (<em>Bipolaris maydis<\/em>)<\/h3><p>-\u00a0<a href=\"https:\/\/metos.global\/ro\/disease-models-corn\/#sclb-biology-and-disease\">SCLB: Biologie \u0219i ciclul bolilor<\/a><br \/>-\u00a0<a href=\"https:\/\/metos.global\/ro\/disease-models-corn\/#sclb-infection-model\">SCLB: Model de infec\u021bie<\/a><\/p><p>Southern Corn Leaf Blight este o boal\u0103 cauzat\u0103 de ciuperca patogen\u0103\u00a0<em>Bipolaris maydis<\/em>. Aceasta a fost o boal\u0103 minor\u0103 a porumbului timp de mul\u021bi ani, f\u0103r\u0103 efect economic asupra produc\u021biei. \u00cen 1970, o tulpin\u0103 extrem de virulent\u0103, numit\u0103 rasa T, a ap\u0103rut pe hibrizii de porumb cu citoplasm\u0103 male-steril\u0103 Texas. Pierderile au fost severe.<\/p><p><span style=\"text-decoration: underline;\">Simptomele<\/span><\/p><p>Simptomele leziunilor rasiale sunt \u00een form\u0103 de fus cu halouri galben-verzui. Ulterior, acestea vor avea margini \u00eentunecate, de culoare brun-ro\u0219iatic\u0103 \u0219i apar pe frunze, tulpini, teci de frunze, coji \u0219i \u0219an\u021buri. Apare Cob Rot ear, precum \u0219i c\u0103derea urechii. Ciuperca ierneaz\u0103 \u00een resturile de porumb \u0219i pe semin\u021be. V\u00e2ntul \u0219i stropii de ap\u0103 \u00eempr\u0103\u0219tie rapid sporii \u00een c\u00e2mp \u00een condi\u021bii ideale, cicatriz\u00e2nd \u00een aproximativ 72 de ore. Combaterea cu hibrizi rezisten\u021bi.<\/p><p><span style=\"text-decoration: underline;\">Biologia \u0219i ciclul bolilor<\/span><\/p><p>B\u0103\u0219icarea frunzelor de porumb din sud (SCLB) este favorizat\u0103 de\u00a0<u>temperaturi calde (20-32\u00b0C sau 68-90\u00b0F) \u0219i umiditate ridicat\u0103<\/u>. Astfel, tinde s\u0103 fie o problem\u0103 \u00een jum\u0103tatea sudic\u0103 a statului Illinois, de\u0219i poate fi g\u0103sit\u0103 \u0219i mai la nord, dac\u0103 condi\u021biile meteorologice sunt favorabile. Frecvent\u00a0<u>perioade ploioase<\/u> favorizeaz\u0103 dezvoltarea bolii.<\/p><p>Simptomele SCLB sunt\u00a0<u>leziuni foliare<\/u>\u00a0variind de la pete minuscule la pete de o jum\u0103tate de inch l\u0103\u021bime \u0219i un inch \u0219i jum\u0103tate lungime. Acestea sunt alungite, cu laturile paralele \u0219i au o culoare de la cafeniu la cenu\u0219iu. Pe leziuni poate ap\u0103rea o margine violacee sau maro, \u00een func\u021bie de fondul genetic al plantei. Infec\u021biile timpurii \u0219i severe la plantele sensibile le predispune la putrezirea tulpinii.<\/p><p>Ciuperca ierneaz\u0103 \u00een resturile de porumb sub form\u0103 de spori sau miceliu.\u00a0<u>Sporii sunt r\u0103sp\u00e2ndi\u021bi de v\u00e2nt sau de stropi de ap\u0103.<\/u> la cre\u0219terea plantelor. Dup\u0103 infectare \u0219i colonizare, sporula\u021bia din aceste leziuni primare serve\u0219te ca surs\u0103 de r\u0103sp\u00e2ndire secundar\u0103 \u0219i de infec\u021bii, at\u00e2t timp c\u00e2t condi\u021biile meteorologice sunt favorabile dezvolt\u0103rii bolii \u0219i sunt prezente \u021besuturi vii. Ciclul bolii se poate repeta la c\u00e2teva zile \u00een condi\u021bii ideale. Germinarea sporilor \u0219i p\u0103trunderea \u00een plant\u0103 pot avea loc \u00een \u0219ase ore, atunci c\u00e2nd la suprafa\u021ba frunzelor este prezent\u0103 ap\u0103 liber\u0103 \u0219i temperaturile sunt cuprinse \u00eentre 15 \u0219i 28\u00b0C. Combaterea SCLB este u\u0219or de realizat cu hibrizi rezisten\u021bi. De\u0219i la unii hibrizi se poate observa o u\u0219oar\u0103 p\u0103tare, aceasta este pur \u0219i simplu o parte a reac\u021biei de rezisten\u021b\u0103 \u0219i nu duce la pierderi economice.<\/p><p>\u00cengroparea reziduurilor de cultur\u0103 este util\u0103 acolo unde eroziunea nu reprezint\u0103 o problem\u0103. Rota\u021bia culturilor este sugerat\u0103 \u00een special \u00een cazul \u00een care se utilizeaz\u0103 sem\u0103natul direct sau \u00een cazul \u00een care se g\u0103sesc reziduuri grele de culturi. Deoarece aceast\u0103 ciuperc\u0103 ierneaz\u0103 pe resturi, plantarea porumbului \u00een astfel de reziduuri poate duce la o infec\u021bie mai timpurie \u0219i la o performan\u021b\u0103 slab\u0103 a r\u0103sadurilor. Fungicidele foliare sunt utile \u00een c\u00e2mpurile de produc\u021bie de semin\u021be. Pentru o combatere optim\u0103, este important s\u0103 se controleze boala foliar\u0103 \u00een perioada cuprins\u0103 \u00eentre 14 zile \u00eenainte de floare \u0219i 21 de zile dup\u0103 floare. Cercet\u0103rile au ar\u0103tat c\u0103 aceast\u0103 perioad\u0103 de patru s\u0103pt\u0103m\u00e2ni este cea mai critic\u0103 pentru daunele provocate de arsura foliar\u0103 \u0219i c\u0103 randamentul \u0219i calitatea sunt cele mai afectate \u00een cazul \u00een care consangvinii susceptibili nu sunt proteja\u021bi \u00een aceast\u0103 perioad\u0103.<\/p><p><span style=\"text-decoration: underline;\">Model de infec\u021bie<\/span><\/p><p>Aceast\u0103 boal\u0103 are nevoie de ap\u0103 liber\u0103 (umezeala frunzelor) pentru a infecta \u021besuturile plantelor. Prin urmare, condi\u021biile pentru \u00eenceperea unei infec\u021bii sunt:\u00a0<u>umezeala frunzelor \u0219i temperaturi mai mari de 15\u00b0C<\/u>. Infec\u021bia se va \u00eencheia dup\u0103 ce vom putea acumula 100 de ore de temperatur\u0103 \u0219i de umezeal\u0103 a frunzelor.<\/p><p>START SCLBinfec\u021bie: dac\u0103 umezeala frunzelor &gt; 0 \u0219i temperatura aerului &gt;= 15 atunci \u00eencepe<\/p><p>CRE\u0218TEREA INFEC\u021aIEI: SCLBinfec\u021bie or\u0103 real\u0103 =SCLBinfec\u021bie or\u0103 anterioar\u0103 + (temperatura aerului * perioada de umezeal\u0103 a frunzelor \u00een minute)<\/p><p>STOP: dac\u0103 nu sunt date condi\u021biile (f\u0103r\u0103 umezeal\u0103 a frunzelor, temperatur\u0103 sub 15\u00b0C) sau dac\u0103 SCLBinfec\u021bie &gt; 100*60 \u00b0C (= grade-minut), atunci SCLBinfec\u021bie = 100*60 (\u00een total 6000 de grade-minut sau 100 de grade-ore (ceea ce \u00eenseamn\u0103, de exemplu, aproximativ 6 ore de umezeal\u0103 a frunzelor la 15\u00b0C sau 5 ore de umezeal\u0103 a frunzelor la 18\u00b0C), umezeala frunzelor la o temperatur\u0103 mai mare de 15\u00b0C este maxim\u0103).<br \/>(Dac\u0103 temperatura este mai mare de 15\u00b0C \u0219i umezeala frunzelor este mai mare de 100*60\u00b0C temperatur\u0103 acumulat\u0103 pe minut, infec\u021bia este complet\u0103).<\/p><p>Aceste modele au fost concepute \u00een conformitate cu Raportul privind bolile plantelor 202 - Boli \u0219i pete comune ale frunzelor de porumb, de Mohammad Babadoost.<\/p><p>Specialist \u00een boli ale fructelor \u0219i legumelor, Departamentul de \u0218tiin\u021be ale Culturilor, Universitatea Illinois din Urbana-Champaign.<\/p><h3>B\u0103\u0219icu\u021ba frunzelor de porumb din nord (<em>Exserohilum turcicum<\/em>)<\/h3><p><u>B\u0103\u0219icarea frunzelor de porumb din nord (NCLB)<\/u>, cauzat\u0103 de ciuperca\u00a0<em>Exserohilum turcicum<\/em>\u00a0numit anterior\u00a0<em>Helmithosporium turcicum<\/em>, poate provoca pierderi de recolt\u0103 \u00een zonele umede \u00een care se cultiv\u0103 porumb. \u00cen climatul moderat umed, boala poate ap\u0103rea peste tot, dar de obicei nu apare \u00een c\u00e2mpuri \u00eenainte de \u00eensilozare. Aceast\u0103 boal\u0103 cauzeaz\u0103 rareori pierderi semnificative de recolt\u0103 pe timp uscat, dar \u00een perioadele cu vreme umed\u0103 poate duce la pierderi de peste 30%, \u00een special atunci c\u00e2nd se instaleaz\u0103 pe frunzele superioare \u00een stadiul de \u00eensilozare a porumbului. \u00cen cazul \u00een care pagubele foliare sunt doar moderate sau sunt \u00eent\u00e2rziate p\u00e2n\u0103 la aproximativ 6 s\u0103pt\u0103m\u00e2ni dup\u0103 \u00eensilozare, pierderile de produc\u021bie sunt \u00een mare parte minime. Bacteria nordic\u0103 a frunzelor de porumb predispune, de asemenea, porumbul la putrezirea tulpinii prin cre\u0219terea stresului asupra plantelor.<\/p><p><span style=\"text-decoration: underline;\">Model de infec\u021bie<\/span><\/p><p><em>Exserohilum turcicum<\/em>\u00a0este capabil s\u0103 infecteze frunzele plantei de porumb atunci c\u00e2nd sunt asigurate condi\u021biile de temperatur\u0103 \u0219i de umezeal\u0103 a frunzelor. Intervalul de timp pentru a infecta \u021besutul plantei este \u00een func\u021bie de\u00a0<span style=\"text-decoration: underline;\">temperatura real\u0103 a aerului \u0219i perioada de umezeal\u0103 a frunzelor.<\/span> Infec\u021bia poate avea loc dac\u0103 temperatura este cuprins\u0103 \u00eentre 13\u00b0C \u0219i 28\u00b0C.\u00a0<u>La o temperatur\u0103 de 18\u00b0C va avea nevoie de 18 ore pentru a se infecta.<\/u>. Dac\u0103 temperatura este mai sc\u0103zut\u0103, va avea nevoie de un timp \u0219i mai lung, iar dac\u0103 este mai cald, va avea nevoie de o perioad\u0103 mai scurt\u0103 de umezire a frunzelor.<\/p><p>START de calcul al unei infec\u021bii NCLB: Dac\u0103 (umezeala frunzelor &gt; 0) \u0219i (temperatura aerului &gt;= 13) \u0219i (temperatura aerului  (18-13)*18*60 atunci NCLBinfec\u021bie = (18-13)*18*60. Aceasta \u00eenseamn\u0103 c\u0103, \u00een total, se pot atinge 5400 de grade\/minut (= 90 de grade\/or\u0103) \u0219i atunci se produce o infec\u021bie (= (18\u00b0C- 13\u00b0C)*18 ore de umezeal\u0103 a frunzelor \u00een minute (18*60). La 18\u00b0C este nevoie de 18 ore de umezeal\u0103 a frunzelor pentru o infec\u021bie. \u00cen cazul \u00een care temperatura este mai ridicat\u0103 sau perioadele de umezeal\u0103 a frunzelor sunt mai lungi, este tot 5400 (toate valorile de mai sus reprezint\u0103 100% de infec\u021bie).<\/p><p>Aceste modele au fost concepute \u00een conformitate cu Raportul privind bolile plantelor 202 - Boli \u0219i pete comune ale frunzelor de porumb, de Mohammad Babadoost.<\/p><p>M. Babadoost este specialist \u00een boli ale fructelor \u0219i legumelor, Departamentul de \u0218tiin\u021be ale Culturilor, Universitatea din Illinois la Urbana-Champaign.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-b99cca3 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"b99cca3\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-f5c5682\" data-id=\"f5c5682\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-218e30d elementor-widget-divider--view-line elementor-widget elementor-widget-divider\" data-id=\"218e30d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"divider.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-divider\">\n\t\t\t<span class=\"elementor-divider-separator\">\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-39060d2 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"39060d2\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-12b0fd4\" data-id=\"12b0fd4\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-e978158 elementor-widget elementor-widget-menu-anchor\" data-id=\"e978158\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"menu-anchor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-menu-anchor\" id=\"corn-fusarium-ear-rot\"><\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-86bbb6f elementor-widget elementor-widget-heading\" data-id=\"86bbb6f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Fusarium ear rot<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-97d8a08 elementor-widget elementor-widget-text-editor\" data-id=\"97d8a08\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Fusarium Ear Rot este cea mai frecvent\u0103 boal\u0103 fungic\u0103 la urechile de porumb. Este cauzat\u0103 de mai multe specii de\u00a0<em>Fusarium<\/em>.<\/p><h3><strong>Simptomele<\/strong><\/h3><p>Simptomele putregaiului Fusarium sunt mucegaiuri de culoare alb\u0103 p\u00e2n\u0103 la roz sau somon, care \u00eencep oriunde pe ureche sau sunt \u00eempr\u0103\u0219tiate pe toat\u0103 suprafa\u021ba acesteia. Adesea, putregaiul \u00eencepe cu boabe deteriorate de insecte. De obicei, nu implic\u0103 \u00eentreaga ureche. Boabele infectate sunt adesea cafenii sau maro, sau au stria\u021bii albe. Aceste ciuperci pot produce micotoxine.<\/p><h3>Biologie a <em>Fusarium ssp.<\/em> pe porumb<\/h3><p>Cele mai frecvente boli ale urechii \u00een Midwest sunt cauzate de\u00a0<em>Fusarium spp.<\/em>\u00a0ciuperci.\u00a0<u>\"Fusarium ear rot\" sau \"Fusarium kernel rot\"<\/u>\u00a0se refer\u0103 la boala cauzat\u0103 de\u00a0<em>Fusarium verticillioides, F. proliferatum \u0219i F. subglutinans<\/em>. Simptomele putregaiului Fusarium sunt un mucegai de culoare alb\u0103 spre roz sau somon, care \u00eencepe oriunde pe ureche sau este \u00eempr\u0103\u0219tiat pe toat\u0103 suprafa\u021ba. Adesea, putregaiul \u00eencepe cu boabe deteriorate de insecte, dar cea mai mare parte a urechii poate fi afectat\u0103. Boabele infectate sunt adesea de culoare cafeniu sau maro, sau au stria\u021bii albe. Speciile de Fusarium cauzeaz\u0103, de asemenea, putrezirea tulpinilor de porumb. Ciupercile supravie\u021buiesc pe reziduurile de porumb \u0219i pe reziduurile altor plante, \u00een special pe cele de graminee. Sporii de Fusarium sunt r\u0103sp\u00e2ndi\u021bi de v\u00e2nt \u0219i de stropi de ploaie la m\u0103ce\u0219e, care sunt cele mai sensibile deoarece sunt senescente \u0219i devin maro. Infectarea miezului poate avea loc, de asemenea, prin tulpin\u0103, dar acest mod de infectare a miezului este mai pu\u021bin frecvent. Boabele deteriorate de insecte sunt foarte sensibile, iar sporii purta\u021bi de insecte pot infecta boabele deteriorate.<\/p><p><u>Putregaiul urechii Gibberella<\/u>\u00a0de porumb este cauzat\u0103 de ciuperca\u00a0<em>Gibberella zeae<\/em>, cunoscut \u0219i sub numele de\u00a0<em>Fusarium graminearum<\/em>.<\/p><p>Maisfusarium1 1 1Se poate identifica cel mai u\u0219or dup\u0103 culoarea ro\u0219ie sau roz a mucegaiului. Aproape \u00eentotdeauna \u00eencepe la v\u00e2rful urechii. \u00cen unele cazuri, culoarea este prea palid\u0103 pentru a fi v\u0103zut\u0103 cu u\u0219urin\u021b\u0103, astfel \u00eenc\u00e2t mucegaiul pare alb. \u00cen acest caz, este posibil s\u0103 nu fie \u00eentotdeauna posibil s\u0103 se disting\u0103\u00a0<em>Gibberella<\/em>\u00a0de putregaiul urechii de Fusarium ear rot f\u0103r\u0103 examinare microscopic\u0103.<\/p><p>Aceast\u0103 ciuperc\u0103 provoac\u0103, de asemenea, putregaiul tulpinii de porumb \u0219i p\u0103duchele de gr\u00e2u; supravie\u021buie\u0219te \u00een porumb \u0219i \u00een reziduurile de cereale mici.<\/p><p>Sporii acestei ciuperci se infecteaz\u0103 prin m\u0103tase; nu se crede c\u0103 infec\u021biile de tulpin\u0103 duc la putrezirea urechilor cu Gibberella. Sporii ajung pe m\u0103tase prin stropire cu ap\u0103 sau pot fi purta\u021bi de insecte. Infec\u021biile pot proveni mai degrab\u0103 de la r\u0103nile provocate de insecte dec\u00e2t de la v\u00e2rful urechii.<\/p><p>Infec\u021biile cu Gibberella pentru putregaiul urechii apar mai frecvent atunci c\u00e2nd\u00a0<u>vremea este r\u0103coroas\u0103 \u0219i umed\u0103<\/u>\u00a0\u00een timpul primelor cinci zile de la \u00eensilozare. Dezvoltarea continu\u0103 a mucegaiului depinde, de asemenea, de\u00a0<u>ulterior vreme rece \u0219i umed\u0103. Temperaturile optime pentru dezvoltarea bolii sunt de 19\u00b0C - 24\u00b0C.<\/u><\/p><h3>Model de infec\u021bie cu Fusarium la porumb<\/h3><p>Porumbul \u0219i gr\u00e2ul sunt susceptibile la infec\u021bii cu fusarium \u00een stadiul BBCH 61-75. Dup\u0103 stadiul 75, modelul este utilizat numai \u00een cazul unor infest\u0103ri puternice de buburuza european\u0103 a porumbului.<\/p><p>Agen\u021bii fungici apar\u021bin\u00e2nd complexului Fusarium Head Blight la porumb sunt cunoscu\u021bi ca fiind favoriza\u021bi de\u00a0<u>temperaturi calde de 20 \u00b0C p\u00e2n\u0103 la 30 \u00b0C<\/u>\u00a0\u0219i\u00a0<u>perioade umede lungi<\/u>. Perioadele de umezeal\u0103 a frunzelor care dureaz\u0103 c\u00e2teva zile vor duce la apari\u021bia simptomelor vizibile timpurii. Dar simptomele pot fi observate dup\u0103 o perioad\u0103 de laten\u021b\u0103 mai lung\u0103 dac\u0103 infec\u021bia este urmat\u0103 de o perioad\u0103 de umezeal\u0103 a frunzelor de 18 ore sau chiar mai scurt\u0103. Simptomele pot fi observate \u0219i dup\u0103 inocularea artificial\u0103 la temperaturi de 15\u00b0C. Rezum\u00e2nd toate combina\u021biile diferite de temperaturi \u0219i umiditate, pe care le-am g\u0103sit \u00een literatura de specialitate, am decis s\u0103 subliniem c\u0103 infec\u021biile cu Fusarium Head blight se produc dac\u0103\u00a0<u>temperatura \u0219i perioada sau perioadele de umezeal\u0103 a frunzelor cu umiditate relativ\u0103 mai mare de 85%<\/u>\u00a0dep\u0103\u0219esc valorile vizualizate \u00een graficul urm\u0103tor.<\/p><p><u>Infec\u021biile sunt declan\u0219ate atunci c\u00e2nd temperatura aerului este cuprins\u0103 \u00eentre 2 \u0219i 32\u00b0C, iar suma precipita\u021biilor este de 2 mm sau mai mare sau umiditatea relativ\u0103 mai mare de 85%. Infec\u021bia cre\u0219te atunci c\u00e2nd umiditatea rel. r\u0103m\u00e2ne egal\u0103 sau mai mare de 85% (c\u00e2nd nu apare umezeala frunzelor). Dar dac\u0103 umiditatea relativ\u0103 scade mai jos de 85%r.h., progresul infec\u021biei se opre\u0219te.<\/u><\/p><p>Se poate presupune c\u0103 exist\u0103 o infec\u021bie cu Fusarium Head Blight dac\u0103 valoarea progresului infec\u021biei atinge 100%. Calculul acestei valori de progres urmeaz\u0103 rela\u021bia dintre durata condi\u021biilor umede \u0219i temperatura afi\u0219at\u0103 \u00een graficul de mai sus.<\/p><p>Acest model este utilizat pentru a vizualiza zilele de infec\u021bie \u0219i condi\u021biile climatice. Cunoa\u0219terea de c\u0103tre cultivator a stadiului de dezvoltare a diferitelor soiuri de gr\u00e2u pe care le cultiv\u0103, ceea ce \u00eei ofer\u0103 posibilitatea de a accesa dac\u0103 ar trebui s\u0103 aplice o pulverizare curativ\u0103 imediat dup\u0103 infec\u021bie.<\/p><p><em>Referin\u021be:<\/em><\/p><ul><li>Infektion und Ausbreitung von Fusarium spp. an Weizen in Abh\u00e4ngigkeit der Anbaubedingungen im Rheinland, Lienemann, K.; E.-C. Oerke und H.-W. Dehne<\/li><li>Efectele activit\u0103\u021bii apei, temperaturii \u0219i pH-ului asupra cre\u0219terii izolatelor Fusarium moniliforme \u0219i Fusarium proliferatum din porumb, Sonia Marin, Vicente Sanchis \u0219i Naresh Magan<\/li><li>Interac\u021biunea dintre Fusarium graminearum \u0219i F. moniliforme \u00een urechile de porumb: evolu\u021bia bolii, biomasa fungic\u0103 \u0219i acumularea de micotoxine, L. M. Reid, R. W. Nicol, T. Ouellet, M. Savard, J. D. Miller, J. C. Young, D. W. Stewart \u0219i A. W. Schaafsma<\/li><li>Evaluierung von Einflussfaktoren auf den Fusarium-\u00c4hrenbefall des Weizens, Wolf, P. F. J.; Schempp, H.; Verreet, J.-A.<\/li><\/ul><h3>Modelul de alert\u0103 pentru micotoxinele Fusarium din porumb<\/h3><p>Testele de infec\u021bie cu perioade prelungite de umezeal\u0103 a frunzelor de\u00a0<u>Fusarium Head Blight<\/u>\u00a0conduc la con\u021binuturi ridicate \u00een\u00a0<u>micotoxin\u0103<\/u>. Prin urmare, se presupune c\u0103 o perioad\u0103 de umezeal\u0103 a frunzelor de 48 de ore sau mai mult \u00een timpul etapelor 61 \u0219i 69 prezint\u0103 un risc ridicat de micotoxine. Analizele con\u021binutului de DON \u00een gr\u00e2ul cultivat \u00een comer\u021b au ar\u0103tat c\u0103 perioadele de umezeal\u0103 a frunzelor suficient de lungi pentru a permite infectarea, dup\u0103 o infec\u021bie ini\u021bial\u0103 \u00een stadiile 61-69, pot cre\u0219te \u0219i ele valorile DON. \u00cen cazul unor perioade mai lungi de umezeal\u0103 a frunzelor, micotoxinele pot cre\u0219te p\u00e2n\u0103 la stadiul 75. Infec\u021biile ulterioare vor fi posibile numai \u00een interac\u021biunea cu buburuza european\u0103 a porumbului.<\/p><p>Fieldclimate acumuleaz\u0103 un\u00a0<u>cifr\u0103 de risc propor\u021bional\u0103 cu evolu\u021bia infec\u021biei<\/u>\u00a0pentru fiecare perioad\u0103 de infec\u021bie reu\u0219it\u0103 pe parcursul perioadei, care a fost selectat\u0103 pentru a fi adecvat\u0103 pentru aceste calcule.\u00a0<u>Se acord\u0103 un risc de 100%, atunci c\u00e2nd au fost \u00eendeplinite \u0219ase perioade de infec\u021bie complete.<\/u>. \u00cen mod normal, perioada de umezeal\u0103 a frunzelor care duce la o infec\u021bie cu Fusarium este mai lung\u0103 dec\u00e2t cea minim\u0103 necesar\u0103. Prin urmare, majoritatea infec\u021biilor cu Fusarium vor duce la o cre\u0219tere a riscului mai mare de 17%.\u00a0<u>valoarea de risc care indic\u0103 o situa\u021bie problematic\u0103 \u00een ceea ce prive\u0219te micotoxinele depinde de istoricul c\u00e2mpului<\/u>. Porumbul cultivat dup\u0103 porumbul cultivat f\u0103r\u0103 lucrare a solului poate prezenta doar un risc mic dac\u0103 nu este stropit \u00een situa\u021bia optim\u0103. La porumbul neaspersionat trebuie s\u0103 ne a\u0219tept\u0103m la valori crescute ale DON deja dup\u0103 35% de risc. Porumbul cultivat \u00een urma cultiv\u0103rii solului poate prezenta un risc mai mare de 70%. Porumbul din primul an trebuie testat pentru DON dac\u0103 riscul dep\u0103\u0219e\u0219te 100%.<\/p><p><em>Referin\u021b\u0103:<\/em><\/p><ul><li>Fusarium bei Mais - ein ernstzunehmendes Problem, Kolbenfusariose, Fusarium, Mais, DON, Mykotoxine, Fumonisine, H\u00f6chstwerte, Landwirtschaftliches Technologiezentrum Augustenberg (LTZ), Ne\u00dflerstr. 23-31, 76227 Karlsruhe<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-6c2d94f elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"6c2d94f\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-fd921a4\" data-id=\"fd921a4\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-e2dba2e elementor-widget-divider--view-line elementor-widget elementor-widget-divider\" data-id=\"e2dba2e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"divider.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-divider\">\n\t\t\t<span class=\"elementor-divider-separator\">\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-bda4c9f elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"bda4c9f\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-7e7cdcc\" data-id=\"7e7cdcc\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-f9bccc7 elementor-widget elementor-widget-menu-anchor\" data-id=\"f9bccc7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"menu-anchor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-menu-anchor\" id=\"corn-gray-leaf-spot\"><\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5391cba elementor-widget elementor-widget-heading\" data-id=\"5391cba\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">P\u0103tarea gri a frunzelor<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-452edb2 elementor-widget elementor-widget-text-editor\" data-id=\"452edb2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>P\u0103tarea cenu\u0219ie a frunzelor de porumb este cauzat\u0103 de ciuperca patogen\u0103\u00a0<em><u>Cercospora zea maydis<\/u>.<\/em><\/p><p>Dezvoltarea bolii depinde de soiul hibridului de porumb \u0219i de condi\u021biile meteorologice. Acesta este motivul pentru care, \u00een unele locuri, infec\u021bia este local sever\u0103, \u00een timp ce \u00een altele nu a avut loc nicio infec\u021bie.<\/p><h3>Simptomele<\/h3><p>Simptomele sunt observate pe frunze ca leziuni mici, punctiforme, \u00eenconjurate de halouri galbene. Uneori este dificil s\u0103 se identifice boala \u00een acest stadiu. Atunci c\u00e2nd leziunile se maturizeaz\u0103, acestea se alungesc \u00een pete \u00eenguste, dreptunghiulare, de culoare maro spre gri, se extind paralel cu nervurile frunzelor \u0219i devin lungi de aproximativ 3,5 - 5 cm. Simptomele depind de susceptibilitatea hibrizilor \u0219i variaz\u0103 \u00eentre ei. Simptomele petelor cenu\u0219ii ale frunzelor ar putea fi similare cu alte boli fungice foliare, cum ar fi antracnoza frunzelor, p\u0103tarea ochilor sau rugina comun\u0103. Simptomele petei cenu\u0219ii a frunzelor de porumb Ciclul de infec\u021bie al ciupercii patogene - Ciuperca supravie\u021buie\u0219te \u00een timpul iernii pe reziduurile de porumb infectate de la suprafa\u021ba solului. Odat\u0103 cu cre\u0219terea temperaturilor prim\u0103vara, sporii sunt produ\u0219i pe reziduurile de porumb \u0219i stropesc frunzele tinere. Acesta este motivul pentru care simptomele sunt observate \u00een mod obi\u0219nuit pe frunzele inferioare ale plantei. Sporii sunt transporta\u021bi de v\u00e2nt sau de ploaie. - Infec\u021biile apar \u00een timpul unor condi\u021bii lungi de c\u0103ldur\u0103 \u0219i umiditate.<\/p><p>Temperatura de 24\u00b0C p\u00e2n\u0103 la 30\u00b0C este optim\u0103 pentru ciuperc\u0103, precum \u0219i umiditatea relativ\u0103 mai mare de 90%. - Simptomele se manifest\u0103 dup\u0103 perioade lungi de rou\u0103 abundent\u0103, \u00een zonele \u00een care umiditatea este foarte ridicat\u0103 \u0219i roua persist\u0103 mult timp diminea\u021ba. - <em>C. zeae-maydis<\/em> sporii \u00ee\u0219i reduc dezvoltarea \u00een perioadele cu umiditate sc\u0103zut\u0103, dar procesul de infectare \u00eencepe din nou \u00een condi\u021bii de umiditate relativ\u0103 ridicat\u0103. Fiecare leziune poate produce mul\u021bi spori, care sunt stropi\u021bi de ploaie sau transporta\u021bi de v\u00e2nt c\u0103tre frunzele tinere s\u0103n\u0103toase. Acolo supravie\u021buiesc p\u00e2n\u0103 c\u00e2nd condi\u021biile sunt favorabile pentru infectare. - Din cauza duratei procesului de infectare, este posibil ca simptomele s\u0103 nu fie observate dec\u00e2t dup\u0103 c\u00e2teva s\u0103pt\u0103m\u00e2ni de la infectare, \u00een func\u021bie de condi\u021biile meteorologice \u0219i de sensibilitatea hibrizilor. - Vremea cald\u0103 \u0219i uscat\u0103 va limita dezvoltarea bolii \u0219i r\u0103sp\u00e2ndirea acesteia la alte plante. - P\u0103tarea cenu\u0219ie a frunzelor poate avea un impact mare asupra randamentului. Corela\u021bia dintre \u021besutul foliar infectat \u0219i cantitatea de produc\u021bie nu este clar\u0103. Leziunile reduc capacitatea plantei de zone fotosintetice de pe frunze. Reducerea fotosintezei ar putea duce, de asemenea, la putrezirea tulpinii \u0219i la c\u0103dere. Condi\u021bii \u00een c\u00e2mpclimat: - ore \u00eentre 22\u00b0C \u0219i 30\u00b0C\/2,305*2 plus ore de umiditate relativ\u0103 (mai mare sau egal\u0103 cu 90%) \u00een timpul nop\u021bii\/ 3,30*2 - interval de la 0 la 100%.<\/p><h3>Modelul de Gray Leaf Spot<\/h3><p><u>P\u0103tarea cenu\u0219ie a frunzelor de porumb <em>Cercospora zeae-maydis<\/em> Modelul de risc:<\/u><\/p><ul><li>Calculul efectuat \u00een intervalul de timp dintre etapa V4 \u0219i V12<\/li><li>Num\u0103rul de ore cu temperaturi cuprinse \u00eentre 22\u00b0C \u0219i 30\u00b0C \u00eemp\u0103r\u021bit la (2,305*2) plus orele cu umiditate relativ\u0103 &gt; 90% \u00een timpul nop\u021bii \u00eemp\u0103r\u021bit la (3,30*2). Aceast\u0103 valoare poate<\/li><li>variaz\u0103 de la 0 la 100.<\/li><\/ul><p><em>Literatur\u0103:<\/em><\/p><ul><li><a href=\"https:\/\/apsjournals.apsnet.org\/doi\/pdf\/10.1094\/PHYTO-95-0388\">Paul, P.A. \u0219i G.P.Munkvold 2004: Regresia \u0219i modelarea re\u021belei neuronale artificiale pentru predic\u021bia petelor cenu\u0219ii ale frunzelor de porumb, Phyto-95-0388.<\/a><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-9aef2fa elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"9aef2fa\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-ab3da5b\" data-id=\"ab3da5b\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-590896d elementor-widget elementor-widget-menu-anchor\" data-id=\"590896d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"menu-anchor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-menu-anchor\" id=\"recommended-equipment\"><\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f3df160 elementor-widget elementor-widget-heading\" data-id=\"f3df160\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Echipament recomandat<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-cce5495 elementor-section-content-middle elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"cce5495\" data-element_type=\"section\" data-e-type=\"section\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-66 elementor-top-column elementor-element elementor-element-2a26471\" data-id=\"2a26471\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-6833555 elementor-widget elementor-widget-text-editor\" data-id=\"6833555\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><b><i>Verifica\u021bi ce set de senzori este necesar pentru monitorizarea bolilor poten\u021biale ale acestei culturi.<\/i><\/b><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t<div class=\"elementor-column elementor-col-33 elementor-top-column elementor-element elementor-element-432f180\" data-id=\"432f180\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-138b2c7 elementor-align-left elementor-widget elementor-widget-button\" data-id=\"138b2c7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-md\" href=\"\/wp-content\/uploads\/2022\/07\/Crop-solutions-document_2022.pdf\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">DESC\u0102RCA\u021aI FOAIA DE CALCUL<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>Corn disease models CORNLEAF BLIGHT FUSARIUM EAR ROT &#8211;Fusarium spp. GRAY LEAF SPOT &#8211;Cercospora zea maydis Recommended equipment Corn leaf blight Two diseases are summarized under the name\u00a0Corn Leaf Blight. In the moderate and cool climate we will find the\u00a0Northern Corn Leaf Blight\u00a0caused by the disease\u00a0Helminthosporium turcicum. Whereas it warmer climate we might find the\u00a0Southern [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"elementor_header_footer","meta":{"ocean_post_layout":"","ocean_both_sidebars_style":"","ocean_both_sidebars_content_width":0,"ocean_both_sidebars_sidebars_width":0,"ocean_sidebar":"0","ocean_second_sidebar":"0","ocean_disable_margins":"enable","ocean_add_body_class":"","ocean_shortcode_before_top_bar":"","ocean_shortcode_after_top_bar":"","ocean_shortcode_before_header":"","ocean_shortcode_after_header":"","ocean_has_shortcode":"","ocean_shortcode_after_title":"","ocean_shortcode_before_footer_widgets":"","ocean_shortcode_after_footer_widgets":"","ocean_shortcode_before_footer_bottom":"","ocean_shortcode_after_footer_bottom":"","ocean_display_top_bar":"default","ocean_display_header":"default","ocean_header_style":"","ocean_center_header_left_menu":"0","ocean_custom_header_template":"0","ocean_custom_logo":0,"ocean_custom_retina_logo":0,"ocean_custom_logo_max_width":0,"ocean_custom_logo_tablet_max_width":0,"ocean_custom_logo_mobile_max_width":0,"ocean_custom_logo_max_height":0,"ocean_custom_logo_tablet_max_height":0,"ocean_custom_logo_mobile_max_height":0,"ocean_header_custom_menu":"0","ocean_menu_typo_font_family":"0","ocean_menu_typo_font_subset":"","ocean_menu_typo_font_size":0,"ocean_menu_typo_font_size_tablet":0,"ocean_menu_typo_font_size_mobile":0,"ocean_menu_typo_font_size_unit":"px","ocean_menu_typo_font_weight":"","ocean_menu_typo_font_weight_tablet":"","ocean_menu_typo_font_weight_mobile":"","ocean_menu_typo_transform":"","ocean_menu_typo_transform_tablet":"","ocean_menu_typo_transform_mobile":"","ocean_menu_typo_line_height":0,"ocean_menu_typo_line_height_tablet":0,"ocean_menu_typo_line_height_mobile":0,"ocean_menu_typo_line_height_unit":"","ocean_menu_typo_spacing":0,"ocean_menu_typo_spacing_tablet":0,"ocean_menu_typo_spacing_mobile":0,"ocean_menu_typo_spacing_unit":"","ocean_menu_link_color":"","ocean_menu_link_color_hover":"","ocean_menu_link_color_active":"","ocean_menu_link_background":"","ocean_menu_link_hover_background":"","ocean_menu_link_active_background":"","ocean_menu_social_links_bg":"","ocean_menu_social_hover_links_bg":"","ocean_menu_social_links_color":"","ocean_menu_social_hover_links_color":"","ocean_disable_title":"on","ocean_disable_heading":"default","ocean_post_title":"","ocean_post_subheading":"","ocean_post_title_style":"","ocean_post_title_background_color":"","ocean_post_title_background":0,"ocean_post_title_bg_image_position":"","ocean_post_title_bg_image_attachment":"","ocean_post_title_bg_image_repeat":"","ocean_post_title_bg_image_size":"","ocean_post_title_height":0,"ocean_post_title_bg_overlay":0.5,"ocean_post_title_bg_overlay_color":"","ocean_disable_breadcrumbs":"default","ocean_breadcrumbs_color":"","ocean_breadcrumbs_separator_color":"","ocean_breadcrumbs_links_color":"","ocean_breadcrumbs_links_hover_color":"","ocean_display_footer_widgets":"default","ocean_display_footer_bottom":"default","ocean_custom_footer_template":"0","footnotes":""},"class_list":["post-49480","page","type-page","status-publish","hentry","entry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Disease models - corn - METOS by Pessl Instruments<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/metos.global\/ro\/disease-models-corn\/\" \/>\n<meta property=\"og:locale\" content=\"ro_RO\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Disease models - corn - METOS by Pessl Instruments\" \/>\n<meta property=\"og:description\" content=\"Corn disease models CORNLEAF BLIGHT FUSARIUM EAR ROT &#8211;Fusarium spp. GRAY LEAF SPOT &#8211;Cercospora zea maydis Recommended equipment Corn leaf blight Two diseases are summarized under the name\u00a0Corn Leaf Blight. In the moderate and cool climate we will find the\u00a0Northern Corn Leaf Blight\u00a0caused by the disease\u00a0Helminthosporium turcicum. 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