Residual herbicides remain the NUMBER ONE method to help achieve a successful weed management program. However, in dry-land production when rainfall is scarce, activating these tools is obviously a challenge. Our research has noted products like Reflex can lay on the soil and wait nearly 3 weeks for rainfall and still be very effective on weeds that have not emerged. Warrant also performs quite well with our data suggesting it can sit on the soil for about 11 days and still be effective; however, many other products like your yellow herbicides lose activity in the matter of a few days.<\/em><\/p>\n\n\n\n Avoiding injury from herbicides applied preemergence under drought conditions is a huge concern but so is not applying residual herbicides as the potential lack of weed control can be costly. Regardless, deciding to wait until the cotton emerges before applying herbicides may be the only option for some acres. If one decides to plant cotton into dry soils without residual herbicides, there are several key points to consider regarding weed control.<\/em><\/p>\n\n\n\n First<\/strong>, there needs to be no weeds emerged (especially Palmer) when the cotton seed is placed in dry soil. In theory, if the field is weed-free when dusting cotton in the soil then no additional weeds should emerge until it rains.<\/em> <\/p>\n\n\n\n Second, <\/strong>the first postemergence herbicide application should occur as soon as the cotton is fully emerged; the treatment must kill emerged weeds and must include residual herbicides. The level of selection pressure placed on the postemergence herbicide in this situation is very high and not sustainable in time. <\/em><\/p>\n\n\n\n Third,<\/strong> a second postemergence herbicide application should be made 12 to 15 days later and again should include a residual product; this application timing assumes you were timely with the first postemergence application. If you were not timely, the interval needs to be shortened following label recommendations. And finally, the value of the layby application in fields without a preemergence herbicide increases astronomically.<\/em><\/p>\n\n\n\n Benghal dayflower aka tropical spiderwort c<\/strong>ontinues to maintain its status of being a major pest for many Georgia cotton farmers. To successfully manage this pest, one must understand the importance of placing effective residual herbicides strategically throughout the growing season starting at planting. The most effective herbicide option at planting is Warrant! If the weed is up before planting, Gramoxone + diuron or 2,4-D are extremely effective. The slide to the right provides potential season long program approaches.<\/em><\/p>\n\n\n\n Dr. Culpepper gives cotton growers his thoughts on ryegrass and residual herbicides. Please pay attention to the residual herbicide section of this blog post. Ryegrass that cannot be controlled with Roundup has been documented in Georgia and complaints of Roundup \u201cmissing\u201d ryegrass are rising very quickly. Be certain to document fields where these escapes are […]<\/p>\n","protected":false},"author":67,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4,38],"tags":[],"class_list":["post-8165","post","type-post","status-publish","format-standard","hentry","category-cotton","category-weed-managment"],"_links":{"self":[{"href":"https:\/\/site.extension.uga.edu\/colquittag\/wp-json\/wp\/v2\/posts\/8165","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/site.extension.uga.edu\/colquittag\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/site.extension.uga.edu\/colquittag\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/site.extension.uga.edu\/colquittag\/wp-json\/wp\/v2\/users\/67"}],"replies":[{"embeddable":true,"href":"https:\/\/site.extension.uga.edu\/colquittag\/wp-json\/wp\/v2\/comments?post=8165"}],"version-history":[{"count":1,"href":"https:\/\/site.extension.uga.edu\/colquittag\/wp-json\/wp\/v2\/posts\/8165\/revisions"}],"predecessor-version":[{"id":8167,"href":"https:\/\/site.extension.uga.edu\/colquittag\/wp-json\/wp\/v2\/posts\/8165\/revisions\/8167"}],"wp:attachment":[{"href":"https:\/\/site.extension.uga.edu\/colquittag\/wp-json\/wp\/v2\/media?parent=8165"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/site.extension.uga.edu\/colquittag\/wp-json\/wp\/v2\/categories?post=8165"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/site.extension.uga.edu\/colquittag\/wp-json\/wp\/v2\/tags?post=8165"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}![\"\"](\"https:\/\/site.extension.uga.edu\/colquittag\/files\/2026\/04\/image-29.png\")
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