[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
Thank you to all who attended the Colorado Wheat Field Days! We certainly lucked out with the weather, and it was great to see you all again.<\/p>\n
Stripe rust has been spotted at very low incidence and severity in Kit Carson, Adams, Arapahoe, Weld, Sedgewick, Yuma, and Washington counties (Figure 1). While the weather in Colorado has been conducive to stripe rust disease development, I anticipate that the spore levels will remain low and should not cause widespread disease.<\/p>\n
The decision to spray should depend on the susceptibility of the wheat variety to stripe rust and the growth stage of wheat. Protecting the emerging flag leaf is most important since it is the biggest contributor to grain fill. Wheat that isn\u2019t flowering yet may benefit from a pesticide spray if susceptible varieties are affected. However, be sure to pay attention to the permitted pre-harvest spray interval for each pesticide.<\/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 duringWheat 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
Several samples have tested positive for WSMV and TriMV. 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_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
Tan spot is appearing across much of Colorado at very low levels (Figure 3). Tan spot appears as necrotic (dead, brown) diamond-shaped spots surrounded by yellow halos or borders. It is often found along with Stagonospora leaf blotch (Figure 4).<\/p>\n
Typically, as the weather warms tan spot does not continue to be a problem<\/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\/tan-spot.jpg” alt=”Tan spot on wheat” title_text=”tan-spot” _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 3. <\/b>Tan spot symptoms on wheat.<\/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_image src=”https:\/\/agsci.colostate.edu\/agbio\/wp-content\/uploads\/sites\/127\/2023\/07\/glume-blotch.jpg” alt=”Glume blotch on wheat berries” title_text=”glume-blotch” _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 4. <\/b>Glume blotch caused by Stagonospora fungus.<\/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=”4.20.0″ _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-06-07-23.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":33613,"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-33608","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