{"id":48871,"date":"2022-11-25T13:54:00","date_gmt":"2022-11-25T13:54:00","guid":{"rendered":"https:\/\/dev.metos.global\/?page_id=48871"},"modified":"2024-02-09T09:24:03","modified_gmt":"2024-02-09T09:24:03","slug":"disease-models-asparagus","status":"publish","type":"page","link":"https:\/\/metos.global\/en\/disease-models-asparagus\/","title":{"rendered":"Disease models – asparagus"},"content":{"rendered":"\t\t
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Asparagus<\/b> disease models<\/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
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PURPLE SPOT DISEASE \u2013<\/br>Pleospora herbarium<\/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
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ASPARAGUS RUST \u2013<\/br>Puccinia asparagi<\/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
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BOTRYTIS LEAF SPOT \u2013<\/br>Botrytis cinerea<\/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
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Purple spot disease<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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The Pathogen<\/h3>

Purple spot disease on asparagus spears and fern is caused by the fungus\u00a0Stemphylium vesicarium<\/em>. The fungus survives the winter as sexual spores (ascospores) in a sac (ascus) produced in overwintering structures (pseudothecia) that appear as small black dots on asparagus debris from the previous season. The\u00a0ascospores are released from the ascus by rain and can be carried by the wind to newly emerged asparagus plants, where they cause the primary infection of the growing season. These new infections result in spores (conidia) produced by an asexual process, which in turn can cause secondary infections, a process that is repeated as long as temperatures and rainfall are favorable.<\/p>

The Disease<\/h3>

The emergence of purple spot as a significant problem in the production of asparagus in Michigan may be due to the adoption of a no- till cultural system, whereby the dried fern from the previous season is chopped in April and left on the soil surface. This residue persists through the harvest season (mid-June) and is visible through the fern growth period (late June to September) and is the source of ascospores which start infections early in the growing season. Symptoms of the disease are: The disease appears as numerous, slightly sunken, purplish spots with brown centers occurring on harvested spears and fern. Lesions on spears are often found on the windward side, because blowing sand causes wounding which favours infection. During epidemic years spotting can occur on 60-90% of the spears and may result in rejection of the crop, especially for fresh market sales. Spots also occur on the asparagus ferns, affecting the main stem, secondary branches and needles (cladophylls). Severe infection of the fern can result in premature defoliation of the plant. Increase in the severity of purple spot disease is associated with extended periods of rainfall, fog or dew.<\/p>

Text credit: Mary K. Hausbeck, Professor and Extension Specialist, Michigan State University, Department of Plant Pathology, E. Lansing<\/em><\/p>

TomCast for Asparagus<\/h3>

Background:<\/span> TOMCAST (TOMato disease foreCASTing) is a computer model based on field data that attempts to predict fungal disease development, namely\u00a0Early Blight, Septoria Leaf Spot and Anthracnose\u00a0on tomatoes. Field placed data loggers are recording hourly leaf wetness and temperature data. This data where analysed over a 24 hour period and may result in the formation of a Disease Severity Value (DSV); essentially an increment of disease development. As DSV accumulate, disease pressure continues to build on the crop. When the number of accumulated DSV exceed the spray interval, a fungicide application is recommended to relieve the disease pressure.<\/p>

TOMCAST is derived from the original F.A.S.T. (Forecasting Alternaria solani on Tomatoes) model developed by Dr. Madden, Pennypacker, and MacNab at Pennsylvania State University (PSU). The PSU F.A.S.T. model was further modified by Dr. Pitblado at the Ridgetown College in Ontario into what we now recognize as the TOMCAST model used by Ohio State University Extension.<\/p>

DSV<\/span>\u00a0are: A Disease Severity Value (DSV) is the unit of measure given to a specific increment of disease (early blight) development.<\/p>

In other words, a DSV is a\u00a0numerical representation of how fast or slow disease (early blight) is accumulating\u00a0in a tomato field. The DSV is determined by two factors:\u00a0leaf wetness and temperature\u00a0during the \u201cleaf wet\u201d hours. As the number of leaf wet hours and temperature increases, DSV accumulate at a faster rate. See the Disease Severity Value Chart below.<\/p>

Conversely, when there are fewer leaf wet hours and the temperature is lower, DSV accumulate slowly if at all. When the total number of accumulated DSV exceeds a preset limit, called the spray interval or threshold, a fungicide spray is recommended to protect the foliage and fruit from disease development.<\/p>

The spray interval (which determines when you should spray) can range between 15-20 DSV. The exact DSV a grower should use is usually supplied by the processor and depends on the fruit quality and end use of the tomatoes. Following a 15 DSV spray interval is a conservative use of the TOMCAST system, meaning you will spray more often than a grower who uses a 19 DSV spray interval with the TOMCAST system. The tradeoff is in the number of sprays applied during the season and the potential for difference in fruit quality.<\/p>

\"TomCast_Asparagus\"TomCast with Asparagus<\/span>
Research has determined that the Tom-Cast disease forecaster is a promising alternative to calendar-based spraying of fern in commercial asparagus fields. Tom-Cast alerts growers when the environmental conditions are favorable for purple spot disease development (extended dew or rainy periods accompanied by warm temperatures). Effective fungicides applied according to the Tom-Cast disease forecaster allows growers to manage purple spot disease of asparagus, while saving money and preserving the environment.<\/p>

\"TomCast_asparagus2\"Text credit: Jim Jasinski, TOMCAST Coordinator FOR OHIO, INDIANA, & MICHIGAN<\/em><\/p>

Purple spot Infection model<\/h3>

The\u00a0Stemphylium versicarium<\/em>\u00a0infection model is based on the work of SUHERI and PRICE in onions and LLorent, VILARDELL, BUGIANI, GHERARDI and MONTESINO in pear.<\/p>

Infection curves for light, moderate and severe infections are computed.<\/p>

\"\"<\/p>

\u00a0<\/p>

With this separation into favourable, moderate favourable and very favourable situations it is to the grower to decide how big the disease pressure in a specific field will be and if he has to cover a specific infection.<\/p>

Conditions:
<\/span>Temperature: 11-30\u00b0C
Leaf wetness > 0 (start for infection) or rel. humidity > 90% (just if there was already an infection before calculated and is still holding)
Light infection (11-30\u00b0C), moderate infection (13-30\u00b0C), severe infection (16-30\u00b0C), an array with leaf wetness duration (see above)
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Asparagus Rust<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Asparagus rust Puccinia asparagi<\/em> is favoured by moist and warm climate. Small amounts of rain and wind will distribute the urediaspores whereas heavy rains can wash them down to soil. By this reason a leaf wetness period with more than 10 mm of rain is not taken for an infection periods.\u00a0Leaf wetness periods coming from light rains and dews from 3 to 8 hours with temperatures from 25\u00b0C down to 10\u00b0C can be infection periods\u00a0for urediaspores in summer and late summer.<\/p>

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Botrytis leaf spot<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Botrytis Leaf Spot is caused by the pathogen Botrytis cinerea<\/em>. B. cinerea<\/em> has a very wide host range and is present in every farming or gardening environment.<\/p>

Symptoms<\/strong><\/p>

White sunken spots on leaves are usually the first sign of infection; spots are small (0.5 mm up to 6 mm long) and tend to be oval. They sometimes have a light green halo and may appear water-soaked. The epidermis around the spots may be silvery. When numerous spots are present, leaf tips die back and whole leaves may be killed.\u00a0B. cinerea<\/em>\u00a0spores land on leaf surfaces and, in the presence of moisture, germinate and produce enzymes that kill leaf tissue. The fungus damages the leaf by causing leaf spotting.\u00a0Leaf surfaces must be wet by dew or rain for long periods\u00a0(20 or more hours) for leaf spot to develop.\u00a0The optimum temperature for germination of spores is 15\u00b0C; optimum temperature for mycelial growth is 18\u00b0C to 25\u00b0C. Botrytis Leaf Spot Risk Model\u00a0B. cinerea<\/em>\u00a0infections are related to\u00a0free moisture. In open field production\u00a0leaf wetness\u00a0is a good indicator for this. The graph indicates a leaf wetness period leading to\u00a0B. cinerea<\/em>\u00a0risk of 30%. Dry days will reduce the risk again.<\/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

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Recommended equipment<\/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
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Check which sensor set is needed for monitoring this crop’s potential diseases.<\/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

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\n\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\tDOWNLOAD SPREADSHEET<\/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>\n\t\t","protected":false},"excerpt":{"rendered":"

Asparagus disease models PURPLE SPOT DISEASE \u2013Pleospora herbarium ASPARAGUS RUST \u2013Puccinia asparagi BOTRYTIS LEAF SPOT \u2013Botrytis cinerea Recommended equipment Purple spot disease The Pathogen Purple spot disease on asparagus spears and fern is caused by the fungus\u00a0Stemphylium vesicarium. The fungus survives the winter as sexual spores (ascospores) in a sac (ascus) produced in overwintering structures […]<\/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":"default","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-48871","page","type-page","status-publish","hentry","entry"],"yoast_head":"\nDisease models - asparagus - 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\/en\/disease-models-asparagus\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Disease models - asparagus - METOS by Pessl Instruments\" \/>\n<meta property=\"og:description\" content=\"Asparagus disease models PURPLE SPOT DISEASE \u2013Pleospora herbarium ASPARAGUS RUST \u2013Puccinia asparagi BOTRYTIS LEAF SPOT \u2013Botrytis cinerea Recommended equipment Purple spot disease The Pathogen Purple spot disease on asparagus spears and fern is caused by the fungus\u00a0Stemphylium vesicarium. 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