[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
Stripe rust Stripe rust has been spotted at low incidence and severity across much of Colorado\u2019s wheat growing region (Figure 1). While the weather in Colorado has been conducive to stripe rust disease development, I anticipate that there won\u2019t be a significant disease impact since we are late in the season and the spore levels remain low.<\/p>\n
The likelihood of getting an economic benefit from a fungicide application drops off quickly after flowering, unless more than 65% of the flag leaf area is covered with rust pustules. Additionally, some fungicides have a postharvest interval (PHI) of 30-45 days, so the window for application closes quickly after flowering. Overall, I don’t think it is economically advantageous for most to spray at this point since rust<\/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\/07\/stripe-rust-leaf-blade.jpg” alt=”Stripe Rust on wheat leaf” title_text=”stripe-rust-leaf-blade” _builder_version=”4.20.0″ _module_preset=”default” global_colors_info=”{}”][\/et_pb_image][et_pb_text _builder_version=”4.20.0″ _module_preset=”default” global_colors_info=”{}”]<\/p>\n
Figure 1.<\/b> Very low levels of stripe rust found during Wheat Field Days.<\/p>\n
[\/et_pb_text][\/et_pb_column][et_pb_column type=”1_2″ _builder_version=”4.17.4″ _module_preset=”default” global_colors_info=”{}”][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=”4.17.4″ _module_preset=”default” collapsed=”off” 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
Wheat streak mosaic virus\/Triticum mosaic virus: Several samples have tested positive for WSMV and TriMV (Figure 2). These viruses are transmitted by the wheat curl mite and typically occur together. Symptoms appear as yellow streaks and mosaic, yellow and green patterns on leaves.<\/p>\n
There is no treatment for virus-infected plants, and no miticides are effective against the vector (the wheat curl mite). Controlling volunteer wheat and planting WSMV- and mite-resistant varieties are the best control measures. However, there is no resistance against TriMV available, so controlling volunteer wheat between harvest and planting is critical.<\/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\/07\/wheat-streak.jpg” alt=”wheat streak virus” title_text=”wheat-streak” _builder_version=”4.20.0″ _module_preset=”default” global_colors_info=”{}”][\/et_pb_image][et_pb_text _builder_version=”4.20.0″ _module_preset=”default” global_colors_info=”{}”]<\/p>\n
Figure 2. <\/b>Symptoms of a WSMV and TriMVco-infection.<\/p>\n
[\/et_pb_text][\/et_pb_column][et_pb_column type=”1_2″ _builder_version=”4.20.0″ _module_preset=”default” global_colors_info=”{}”][\/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=”4.20.0″ _module_preset=”default” global_colors_info=”{}”]<\/p>\n
Do you have a disease that you would like diagnosed? Contact the Plant Diagnostic Clinic <\/b><\/a>for sample submission. Or email the plantlab@colostate.edu<\/a><\/span>.<\/p>\n Diagnostics are conducted at no cost <\/i>to farmers!<\/b><\/span><\/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=”4.20.0″ _module_preset=”default” header_level=”h3″ header_font_size=”26px” background_color=”#FFFFFF” custom_padding=”4%|4%|4%|4%|true|true” global_colors_info=”{}”]Dr. Robyn Roberts<\/strong> Growers are strongly encouraged to regularly scout wheat fields for diseases. <\/i><\/b> Many thanks to Tyler Benninghoven, Dr. Esten Mason, and Dr. Ana Cristina Fulladolsa, who contributed to this report.<\/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_button button_url=”https:\/\/agsci.colostate.edu\/agbio\/wp-content\/uploads\/sites\/127\/2023\/07\/wheat-disease-newsletter-6-20-23.pdf” button_text=”Download Newsletter PDF” _builder_version=”4.20.0″ _module_preset=”default” hover_enabled=”0″ global_colors_info=”{}” sticky_enabled=”0″][\/et_pb_button][et_pb_button button_url=”@ET-DC@eyJkeW5hbWljIjp0cnVlLCJjb250ZW50IjoicG9zdF9saW5rX3VybF9wYWdlIiwic2V0dGluZ3MiOnsicG9zdF9pZCI6IjI0MDM5In19@” button_text=”Back to IPM Pest Categories” button_alignment=”left” _builder_version=”4.17.4″ _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":33610,"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-33621","ipm-pests","type-ipm-pests","status-publish","format-standard","has-post-thumbnail","hentry","ipm_pest_categories-wheat-disease-newsletters"],"yoast_head":"\n
\nField Crops Pathologist and CSU Assistant Professor<\/strong>
\nEmail:<\/strong> robyn.roberts@colostate.edu<\/a>*
\nVoice:<\/strong> (970) 491-8239<\/a>
\nTwitter:<\/strong> @RobynRobertsPhD<\/a>
\n*Email is the best way to reach me<\/em>
\n[\/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>\nAdditional Resources<\/h3>\n
The Colorado Wheat Entomology Newsletter<\/b>, written by Dr. Punya Nachappa, covers insect\/mite pests and management tips. The newsletters are published bi-weekly during the growing season.<\/a><\/p>\n\n
Contributors<\/h3>\n