[et_pb_section fb_built=”1″ _builder_version=”4.17.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_row _builder_version=”4.17.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.17.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.27.4″ _module_preset=”default” hover_enabled=”0″ global_colors_info=”{}” sticky_enabled=”0″]<\/p>\n
May 9, 2023<\/p>\n
A root rot disease was found in a few fields in Kit Carson county in spotty areas (Figure 1). Root rot pathogens generally favor wet weather and mild soil temperatures for infection. However, symptoms usually appear after the weather becomes warmer and dryer. Root rot diseases typically develop in nutrient-deficient soils with poor drainage, and\/or high nitrates. Wheat with root rot initially appear chlorotic (yellow), stunted, and have poor tiller development. Roots are blackened and rotten with visible fungal mycelia. Root rot diseases are more common in fields that have not been in rotation.<\/p>\n
[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=”1_2,1_2″ _builder_version=”4.17.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_column type=”1_2″ _builder_version=”4.17.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_image src=”https:\/\/agsci.colostate.edu\/agbio\/wp-content\/uploads\/sites\/127\/2023\/05\/wheat-root-rot-disease.jpg” alt=”wheat plants showing root rot disease” title_text=”wheat-root-rot-disease” _builder_version=”4.20.0″ _module_preset=”default” border_width_top=”4px” border_color_top=”#F15625″ global_colors_info=”{}”][\/et_pb_image][\/et_pb_column][et_pb_column type=”1_2″ _builder_version=”4.17.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_image src=”https:\/\/agsci.colostate.edu\/agbio\/wp-content\/uploads\/sites\/127\/2023\/05\/root-rot-disease.jpg” alt=”wheat plant roots showing root rot disease” title_text=”root-rot-disease” _builder_version=”4.20.0″ _module_preset=”default” border_width_top=”4px” border_color_top=”#F15625″ global_colors_info=”{}”][\/et_pb_image][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=”4.17.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.17.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.20.0″ _module_preset=”default” global_colors_info=”{}”]<\/p>\n
Figure 1.<\/strong> Root rot disease found in samples from Kit Carson county. Note the yellowed leaves and blackened roots and crowns. Management and Prevention:<\/strong> ensure fields have proper drainage and adequate nutrients to prevent infection. Kill volunteer hosts between harvest and planting, since infected plants can carry the pathogen to next season\u2019s crop.<\/p>\n [\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=”4.17.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.17.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.20.0″ _module_preset=”default” global_colors_info=”{}”]<\/p>\n There are currently no reports of stripe rust in Colorado, but stripe rust was recently reported in Texas (Castroville, southeast TX), and Oklahoma (Chicksha, southwest central OK). Disease incidence and severity is low; however recent rain and nighttime temperatures have been conducive to disease development in these areas (Figure 2). Stripe rust disease is dependent upon cool, wet weather, and the dry conditions in Colorado will likely inhibit and\/or limit rust diseases in the near future.<\/p>\n [\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=”1_2,1_2″ _builder_version=”4.20.0″ _module_preset=”default” global_colors_info=”{}”][et_pb_column type=”1_2″ _builder_version=”4.20.0″ _module_preset=”default” global_colors_info=”{}”][et_pb_image src=”https:\/\/agsci.colostate.edu\/agbio\/wp-content\/uploads\/sites\/127\/2023\/05\/min-temp-map-may-9-23.jpg” alt=”temperature map for US” title_text=”min-temp-map-may-9-23″ _builder_version=”4.20.0″ _module_preset=”default” border_width_top=”4px” border_color_top=”#F15625″ global_colors_info=”{}”][\/et_pb_image][\/et_pb_column][et_pb_column type=”1_2″ _builder_version=”4.20.0″ _module_preset=”default” global_colors_info=”{}”][et_pb_image src=”https:\/\/agsci.colostate.edu\/agbio\/wp-content\/uploads\/sites\/127\/2023\/05\/precip-map-may-9-23.jpg” alt=”precipitation map for US” title_text=”precip-map-may-9-23″ _builder_version=”4.20.0″ _module_preset=”default” border_width_top=”4px” border_color_top=”#F15625″ global_colors_info=”{}”][\/et_pb_image][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=”4.20.0″ _module_preset=”default” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.20.0″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.20.0″ _module_preset=”default” global_colors_info=”{}”]<\/p>\n Figure 2.<\/strong> Recent weather in states reporting stripe rust is conducive to disease development, though risk for Colorado remains low. The stripe rust pathogen requires both cooler temperatures and wet conditions to cause disease. States that have reported stripe rust (Texas and Oklahoma, at low incidence and severity) have recently had cooler nighttime temperatures (left panel) and more moisture (right panel), which is conducive to disease development. While nighttime temperatures in Colorado are low, the precipitation is also low, which does not support disease development. Data from the National Weather Service Climate Prediction Center.<\/i><\/a><\/p>\n Soil moisture levels are often correlated with stripe rust incidence and can be used as a predictive tool in determining if stripe rust will emerge. This time of year, we look at the soil moisture levels in the south, particularly Texas and Oklahoma (Figure 3<\/b>). Most of Texas and Oklahoma has been very dry since last fall, and is currently experiencing low soil moisture; however, recent weather conditions have been conducive for disease development. At this time, it seems that stripe rust spore levels will remain low, suggesting a low risk for an epidemic in Colorado. We will continue to monitor for rust and provide recommendations as we reach critical growth stages. Please help us protect our fungicides and prevent fungicide resistance by carefully timing applications, following the label, and applying only when the disease pressure is appropriate. If you think you see symptoms, please feel free to send photos.<\/p>\n [\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row column_structure=”1_2,1_2″ _builder_version=”4.20.0″ _module_preset=”default” global_colors_info=”{}”][et_pb_column type=”1_2″ _builder_version=”4.20.0″ _module_preset=”default” global_colors_info=”{}”][et_pb_image src=”https:\/\/agsci.colostate.edu\/agbio\/wp-content\/uploads\/sites\/127\/2023\/05\/soil-moisture-map-us.jpg” alt=”soil moisture map for US” title_text=”soil-moisture-map-us” _builder_version=”4.20.0″ _module_preset=”default” border_width_top=”4px” border_color_top=”#F15625″ global_colors_info=”{}”][\/et_pb_image][\/et_pb_column][et_pb_column type=”1_2″ _builder_version=”4.20.0″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.20.0″ _module_preset=”default” global_colors_info=”{}”]<\/p>\n Figure 3. Soil moisture levels as a predictive tool for stripe rust risk. Higher soil moisture levels are typically associated with higher risk. We closely watch the southern states (Texas, Oklahoma) for soil moisture levels and the emergence of stripe rust as one tool to predict risk in Colorado. Low soil moisture levels support less stripe rust disease development. Data from the National Weather Service Climate Prediction Center.<\/a><\/p>\n [\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=”4.20.0″ _module_preset=”default” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.20.0″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.20.0″ _module_preset=”default” global_colors_info=”{}”]<\/p>\n We haven\u2019t found any viruses yet this year, but stay on the lookout as things start to green up. Growers are strongly encouraged<\/strong> to regularly scout wheat fields for diseases. Particularly, scout for stripe rust and viruses in the coming weeks.<\/p>\n [\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=”1″ _builder_version=”4.17.4″ _module_preset=”default” background_color=”#F1F1F1″ global_colors_info=”{}”][et_pb_row column_structure=”1_2,1_2″ _builder_version=”4.17.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_column type=”1_2″ _builder_version=”4.17.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_blurb title=”Plant Diagnostic Clinic” use_icon=”on” font_icon=”||fa||900″ icon_color=”#F15625″ icon_placement=”left” image_icon_width=”36px” _builder_version=”4.17.4″ _module_preset=”default” global_colors_info=”{}”]<\/p>\n Do you have a disease that you would like diagnosed?<\/strong><\/p>\n Contact the Plant Diagnostic Clinic for sample submission: https:\/\/plantclinic.agsci.colostate.edu\/<\/a> or plantlab@colostate.edu<\/a>.<\/p>\n [\/et_pb_blurb][et_pb_blurb title=”The Colorado Wheat Entomology Newsletter” use_icon=”on” font_icon=”||fa||900″ icon_color=”#F15625″ icon_placement=”left” image_icon_width=”36px” _builder_version=”4.17.4″ _module_preset=”default” global_colors_info=”{}”]<\/p>\n Written by Dr. Punya Nachappa and Darren Cockrell, covers insect\/mite pests and management tips. The newsletters are published bi-weekly during the growing season and are available here: https:\/\/coloradowheat.org\/category\/news-events\/wheat-pest-and-disease-update\/ <\/span><\/a><\/p>\n [\/et_pb_blurb][\/et_pb_column][et_pb_column type=”1_2″ _builder_version=”4.17.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_blurb title=”Contact Us” use_icon=”on” font_icon=”||divi||400″ icon_color=”#F15625″ image_icon_background_color=”RGBA(255,255,255,0)” icon_placement=”left” image_icon_width=”36px” _builder_version=”4.17.4″ _module_preset=”default” header_level=”h3″ header_font_size=”26px” background_color=”#FFFFFF” custom_padding=”4%|4%|4%|4%|true|true” global_colors_info=”{}”]<\/p>\n Dr. Robyn Roberts<\/strong> [\/et_pb_blurb][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=”1″ _builder_version=”4.17.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_row _builder_version=”4.17.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.17.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_text _builder_version=”4.20.0″ _module_preset=”default” global_colors_info=”{}”]<\/p>\n Many thanks to all who contributed to this report: Tyler Benninghoven, Dr. Esten Mason, Emily Hudson-Arns, Ron Meyer, and Dr. Todd Ballard.<\/p>\n [\/et_pb_text][et_pb_button button_url=”https:\/\/agsci.colostate.edu\/agbio\/wp-content\/uploads\/sites\/127\/2023\/05\/WheatDiseaseLetter_050923.pdf” button_text=”Download Newsletter PDF” _builder_version=”4.20.0″ _module_preset=”default” global_colors_info=”{}”][\/et_pb_button][et_pb_button button_url=”@ET-DC@eyJkeW5hbWljIjp0cnVlLCJjb250ZW50IjoicG9zdF9saW5rX3VybF9wYWdlIiwic2V0dGluZ3MiOnsicG9zdF9pZCI6IjI0MDM5IiwiZW5hYmxlX2h0bWwiOiJvZmYifX0=@” button_text=”Back to IPM Pest Categories” button_alignment=”left” _builder_version=”4.24.2″ _dynamic_attributes=”button_url” _module_preset=”default” custom_button=”on” button_text_color=”#1E4D2B” button_bg_color=”#FFFFFF” button_border_width=”4px” button_border_color=”#1E4D2B” global_module=”27159″ saved_tabs=”all” global_colors_info=”{}”][\/et_pb_button][\/et_pb_column][\/et_pb_row][\/et_pb_section]<\/p>\n","protected":false},"featured_media":32852,"parent":0,"menu_order":0,"template":"","format":"standard","meta":{"_acf_changed":false,"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":""},"ipm_pest_categories":[138],"integrated_pest_management_":[],"pest":[],"class_list":["post-32849","ipm-pests","type-ipm-pests","status-publish","format-standard","has-post-thumbnail","hentry","ipm_pest_categories-wheat-disease-newsletters"],"yoast_head":"\n
Photo: Dr. Ana Cristina Fulladolsa.<\/em><\/p>\nDISEASE WATCH AND MANAGEMENT<\/h2>\n
Stripe Rust<\/h3>\n
Viruses<\/h3>\n
Field Crops Pathologist and CSU Assistant Professor<\/strong>
Email:<\/strong> robyn.roberts@colostate.edu<\/a>*
Voice:<\/strong> (970) 491-8239<\/a>
Twitter:<\/strong> @RobynRobertsPhD<\/a>
*Email is the best way to reach me<\/em><\/p>\nAdditional Resources<\/h3>\n
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CONTRIBUTORS<\/h3>\n