{"id":1628,"date":"2019-03-27T19:25:06","date_gmt":"2019-03-27T19:25:06","guid":{"rendered":"https:\/\/agrilife.org\/texasrowcrops\/?p=1628"},"modified":"2019-03-27T20:00:04","modified_gmt":"2019-03-27T20:00:04","slug":"monitoring-wheat-fields-for-seedling-rust","status":"publish","type":"post","link":"https:\/\/agrilife.org\/texasrowcrops\/2019\/03\/27\/monitoring-wheat-fields-for-seedling-rust\/","title":{"rendered":"Monitoring Wheat Fields for Seedling Rust"},"content":{"rendered":"

By David Drake, John Few, and Tyler Mays – Texas A&M AgriLife Extension Agents \u2013 IPM Commerce, Thrall, and Hillsboro, TX<\/p>\n

In the past several years heavy outbreaks of rust on seedling wheat, especially stripe rust, have warranted and responded favorably to an early fungicide application. This year the disease is present in high levels in the southern part of the state and fungal spores will be carried by wind to the rest of the plains where continued wet weather could provide for ideal disease conditions.<\/p>\n

When scouting seedling wheat fields and deciding on management practices, some important points to consider are:<\/p>\n

Host plant resistance<\/strong> is still the best form of protection and fungicide applications to resistant varieties do not result in increased yields or grain test weight when compared with untreated checks.<\/p>\n

Seedling rust resistance <\/strong>is genetically different from more mature plant resistance. Published variety resistance ratings are focused on the mature plant or the flag leaf and may not apply to the seedling stage wheat.\u00a0 Observations in research and extension trials have shown that very few of the Hard Red Winter wheat varieties have any seedling resistance to stripe rust, Iba and Gallagher are particularly susceptible.\u00a0 In contrast, most of the Soft Red Winter wheat (SRWW) varieties have seedling resistance to stripe rust. A few SRWW varieties that have shown heavy infestations of seedling stripe rust are:\u00a0 25R40, 25R50, and USG 3536.<\/p>\n

Stripe rust differs from leaf rust. <\/strong>Stripe rust also called yellow rust is most active when temperatures are between 50\u2070 and\u00a0 64\u2070 F and have a wet leaf for at least 6 hours.\u00a0 Above 90\u2070F new infections do not occur and leaf rust becomes more of a concern. Stripe rust pustules form in lines along the veins of the leaf, hence the \u201cstripe\u201d term.\u00a0 Leaf rust is more red in color and forms many round pustules distributed around the leaf. See Figures 1-3. Stem rust is also different but less commonly seen in U.S. varieties.<\/p>\n

\"\"<\/a>

Figure 1. Stripe rust on seedling wheat. Photo Courtesy Tyler Mays.<\/p><\/div>\n

 <\/p>\n

\"\"<\/a>

Figure 2. Close up of stripe rust on a mature wheat leaf. Photo Courtesy of Thomas Isakeit.<\/p><\/div>\n

 <\/p>\n

\"\"<\/a>

Figure 3. Leaf rust symptoms. Photo Courtesy of USDA-ARA Cereal Disease Lab.<\/p><\/div>\n

A fungicide application <\/strong>to seedling wheat would be warranted when a susceptible variety has active rust pustules throughout the field and yield and weather conditions are expected to be favorable for disease. Fungicides protect expected yield and are not a replacement for regular scouting and timely management.\u00a0 Control of seedling rust is thought to decrease the spore load that will infect the future emerging upper leaves. The latest Texas A&M AgriLife Extension variety ratings for disease resistance can be found at http:\/\/varietytesting.tamu.edu<\/a> in the 2018 wheat variety trial results.<\/p>\n

Always read and follow the label directions of crop protection products.<\/p>\n

 <\/p>\n

\"\"<\/a>

David Drake, Extension Agent-IPM
Hunt County Office
Texas A&M AgriLife Extension Service
Commerce, TX 75429
Phone: 903-468-3295
david.drake@ag.tamu.edu<\/a><\/p><\/div>\n

 <\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

By David Drake, John Few, and Tyler Mays – Texas A&M AgriLife Extension Agents \u2013 IPM Commerce, Thrall, and Hillsboro, TX In the past several years heavy outbreaks of rust on seedling wheat, especially stripe rust, have warranted and responded favorably to an early fungicide application. This year the disease is present in high levels in the southern part of the state and fungal spores will be carried by wind to the rest of the plains where continued wet weather could provide for ideal disease conditions. When scouting… Read More →<\/a><\/span><\/p>\n","protected":false},"author":1371,"featured_media":1629,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[58,59],"tags":[],"class_list":["post-1628","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-58","category-march-2019"],"acf":[],"yoast_head":"\nMonitoring Wheat Fields for Seedling Rust - Texas Row Crops Newsletter<\/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:\/\/agrilife.org\/texasrowcrops\/2019\/03\/27\/monitoring-wheat-fields-for-seedling-rust\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Monitoring Wheat Fields for Seedling Rust - Texas Row Crops Newsletter\" \/>\n<meta property=\"og:description\" content=\"By David Drake, John Few, and Tyler Mays – Texas A&M AgriLife Extension Agents \u2013 IPM Commerce, Thrall, and Hillsboro, TX In the past several years heavy outbreaks of rust on seedling wheat, especially stripe rust, have warranted and responded favorably to an early fungicide application. 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