{"id":1195,"date":"2017-10-04T19:27:25","date_gmt":"2017-10-04T19:27:25","guid":{"rendered":"https:\/\/agrilife.org\/texasrowcrops\/?p=1195"},"modified":"2017-11-01T20:51:11","modified_gmt":"2017-11-01T20:51:11","slug":"what-is-causing-the-late-season-cotton-defoliation-in-cotton-in-west-texas","status":"publish","type":"post","link":"https:\/\/agrilife.org\/texasrowcrops\/2017\/10\/04\/what-is-causing-the-late-season-cotton-defoliation-in-cotton-in-west-texas\/","title":{"rendered":"What is Causing the Late-season Cotton Defoliation in Cotton in West Texas?"},"content":{"rendered":"

by Dr. Tom Isakeit, Extension Plant Pathologist, – College Station, TX; Dr. Gaylon Morgan, Extension Cotton Agronomist \u2013 College Station, TX;\u00a0 Dr. Jason Woodward, Extension Plant Pathologist – Lubbock<\/p>\n

Many cotton fields in the High Plains and Rolling Plains of Texas are experiencing browning or bronzing of the foliage (Figure 1), often accompanied by premature defoliation.\u00a0 Several leaf spots are commonly associated with such affected foliage.\u00a0 Different species of fungi have been found to cause these leaf spots.\u00a0 These are species of the genera Corynespora<\/em> (Figure 2), Cercospora <\/em>(Figure 3), as well as Alternaria<\/em> and Stemphyllium <\/em>(Figure 4).\u00a0 Some fields have leaf spots associated with only one species, while several species may be present in other fields.\u00a0 However, non-pathogenic stresses are the predominant problem in these fields and the fungal leaf spots are secondary to this.\u00a0 An example of such a stress is potassium deficiency, which can be confirmed by tissue or soil tests.\u00a0 Often, there are interactions with fluctuating moisture and boll load.\u00a0 Although leaf spots can be found on otherwise normal-looking leaves, they generally are found on senescing leaves or leaves showing the other stress symptoms.\u00a0 In general, fungi can readily grow on leaf tissue weakened by the other, non-pathogenic stresses.\u00a0 With cotton, the fungi are probably hastening the defoliation, but they are not likely the main factor in defoliation.<\/p>\n

In other states like Alabama and Georgia, the fungus Corynespora cassiicola<\/em>, which causes target spot, can be pathogens by themselves.\u00a0 Extensive leaf spots on a leaf can lead to early defoliation.\u00a0 Disease development is associated with frequent rain and yield losses can be significant.\u00a0 Reduction in defoliation has been possible with the timely application of fungicides. \u00a0However, the application of fungicides to control fungal spots will not protect yield where the initial culprit is also a major, non-pathogenic stress, as has been seen in several cotton production areas of Texas, including the High Plains and Rolling Plains. \u00a0\u00a0In 2017 trials in the Upper Coast growing area of Texas, which has a higher rainfall and humidity than areas to the west, fungicide applications did not result in any visible differences in the appearance of cotton foliage.<\/p>\n

Similar mid to late season nutrient deficiencies have occurred in years past, and is usually a combination of numerous factors contributing to insufficient nutrient uptake to meet the boll demand, including potassium.\u00a0 These contributing factors include the soil potassium levels, the size of the root system, and boll load.\u00a0 Adequate soil potassium levels are generally present in most of the High Plains and Rolling Plains soils.\u00a0 However, a small root system caused by compaction, nematodes, or early fruit set can lead to reduced potassium uptake by plants and can lead to insufficient potassium to potassium deficiencies in the plant.\u00a0 \u00a0Potassium, phosphorous, and nitrogen are mobile within plants and are transported to the parts of the plants with the most demand.\u00a0 In a crop with heavy boll load, these mobile nutrients will be translocated from the leaves to the developing bolls and causes nutrient deficiencies in the leaves (Figure 5) and can lead to secondary pathogen infections (Figure 6) and discussed above.<\/p>\n

What could or should be done now<\/u> to remediate this current problem?<\/strong>\u00a0 On the positive side, these potassium deficiency symptoms usually only occur in the High Plains and Rolling Plains when the cotton yield potential is high.\u00a0 In addition, observations have been made indicating that severity of leaf spots is often linked to crop maturity and seed size.\u00a0 Development of leaf spot diseases very late in the season in conjunction with these potassium deficiencies should have a minimal impact on cotton yield or quality.\u00a0 In later planted fields that are just beginning to show symptoms, foliar applications of potassium may help elevate some deficiency symptoms, but have a low likelihood of having a positive return on investment for foliar application(s).\u00a0 The possibility of seeing a positive response is less likely this late in the season.\u00a0 Previous research on foliar applications of potassium has shown inconsistent impacts on yield with early and mid-season applications and require multiple foliar applications to move sufficient levels of potassium into the plant through the leaves.\u00a0 However, current research is on-going to evaluate the value of foliar potassium applications in high yielding environments.\u00a0 Likewise, the foliar applications of fungicides are not recommended at this time. Information on the efficacy of such applications has been inconsistent.<\/p>\n

What should be done to minimize the nutrient deficiency symptoms in the future? <\/strong>\u00a0The most important thing is to collect a soil sample and have it analyzed to determine if adequate potassium is plant available in the soil.\u00a0 Once the soil test levels are known (preferably for a 0-6\u201d and deeper samples), then the recommended potassium should be applied and incorporated (or injected) the meet the yield goal.\u00a0 Also, some varieties are more prone to potassium deficiencies than others, but it is not an easy distinction.\u00a0 Recent research in Texas suggests that the soil K threshold levels are likely on the low side.\u00a0 So, if your soil test levels are between 150-200 ppm (Melich III extraction), then growers should consider adding potassium as part of a maintenance program.\u00a0 Yield results from broadcast incorporated and injected applications of KCl have increased yields in most years with the injected applications providing more consistent yield increases when soil potassium levels were below 200 ppm.\u00a0 See Figure 7 below.<\/p>\n

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Figure 1. Leaf symptoms associated with non-pathogenic stress, possibly potassium deficiency.<\/p><\/div>\n

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Figure 2. Leaf spot caused by Corynespora cassiicola (inset:spore).<\/p><\/div>\n

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Figure 3. Leaf spot caused by Cercospora sp. (spore shown in inset).<\/p><\/div>\n

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Figure 4. Senescing leaves that have other fungal leaf spots (insert:Alternaria sp., (right); Semphyllium sp. (left).<\/p><\/div>\n

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Figure 5. Early developments of potassium deficiency symptoms (left) from plots with no potassium applied and cotton plots that received 80 lbs of potassium (injected) prior to planting cotton. Wharton County, TX.<\/p><\/div>\n

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Figure 6. Secondary pathogen infection on cotton in Williamson county, TX that had previously expressed potassium deficiency symptoms due to low soil potassium levels (upper left corner) compared to cotton that received 120 lbs\/a of potassium (lower right corner).<\/p><\/div>\n

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Figure 7. Cotton yield response to soil applied potassium (dry fertilizer incorporated and liquid fertilizer injected) four weeks before planting cotton in 2013 in Wharton county, TX. Soil K analysis levels were at the current threshold of 150 ppm, but yields increased with additional potassium applied, especially through the injected applications.<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"

by Dr. Tom Isakeit, Extension Plant Pathologist, – College Station, TX; Dr. Gaylon Morgan, Extension Cotton Agronomist \u2013 College Station, TX;\u00a0 Dr. Jason Woodward, Extension Plant Pathologist – Lubbock Many cotton fields in the High Plains and Rolling Plains of Texas are experiencing browning or bronzing of the foliage (Figure 1), often accompanied by premature defoliation.\u00a0 Several leaf spots are commonly associated with such affected foliage.\u00a0 Different species of fungi have been found to cause these leaf spots.\u00a0 These are species of the genera Corynespora (Figure 2), Cercospora… Read More →<\/a><\/span><\/p>\n","protected":false},"author":1371,"featured_media":1147,"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":[35,16,42],"tags":[],"class_list":["post-1195","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-35","category-archive","category-october-2017"],"acf":[],"yoast_head":"\nWhat is Causing the Late-season Cotton Defoliation in Cotton in West Texas? - 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\/2017\/10\/04\/what-is-causing-the-late-season-cotton-defoliation-in-cotton-in-west-texas\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What is Causing the Late-season Cotton Defoliation in Cotton in West Texas? - Texas Row Crops Newsletter\" \/>\n<meta property=\"og:description\" content=\"by Dr. Tom Isakeit, Extension Plant Pathologist, – College Station, TX; Dr. Gaylon Morgan, Extension Cotton Agronomist \u2013 College Station, TX;\u00a0 Dr. Jason Woodward, Extension Plant Pathologist – Lubbock Many cotton fields in the High Plains and Rolling Plains of Texas are experiencing browning or bronzing of the foliage (Figure 1), often accompanied by premature defoliation.\u00a0 Several leaf spots are commonly associated with such affected foliage.\u00a0 Different species of fungi have been found to cause these leaf spots.\u00a0 These are species of the genera Corynespora (Figure 2), Cercospora... 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Leaf symptoms associated with non-pathogenic stress, possibly potassium deficiency."},{"@type":"BreadcrumbList","@id":"https:\/\/agrilife.org\/texasrowcrops\/2017\/10\/04\/what-is-causing-the-late-season-cotton-defoliation-in-cotton-in-west-texas\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/agrilife.org\/texasrowcrops\/"},{"@type":"ListItem","position":2,"name":"What is Causing the Late-season Cotton Defoliation in Cotton in West Texas?"}]},{"@type":"WebSite","@id":"https:\/\/agrilife.org\/texasrowcrops\/#website","url":"https:\/\/agrilife.org\/texasrowcrops\/","name":"Texas Row Crops Newsletter","description":"Meeting AgriLife\u2019s Outreach Mission","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/agrilife.org\/texasrowcrops\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Person","@id":"https:\/\/agrilife.org\/texasrowcrops\/#\/schema\/person\/75521ee3b2ee8ccc41538b7b022dc8dc","name":"l-francis","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/secure.gravatar.com\/avatar\/d244a9e9ac7f103f782c39b24f80fe253aa1f98b7e001e1aa93a8c2be21df87f?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/d244a9e9ac7f103f782c39b24f80fe253aa1f98b7e001e1aa93a8c2be21df87f?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/d244a9e9ac7f103f782c39b24f80fe253aa1f98b7e001e1aa93a8c2be21df87f?s=96&d=mm&r=g","caption":"l-francis"},"url":"https:\/\/agrilife.org\/texasrowcrops\/author\/l-francis\/"}]}},"_links":{"self":[{"href":"https:\/\/agrilife.org\/texasrowcrops\/wp-json\/wp\/v2\/posts\/1195","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/agrilife.org\/texasrowcrops\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/agrilife.org\/texasrowcrops\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/agrilife.org\/texasrowcrops\/wp-json\/wp\/v2\/users\/1371"}],"replies":[{"embeddable":true,"href":"https:\/\/agrilife.org\/texasrowcrops\/wp-json\/wp\/v2\/comments?post=1195"}],"version-history":[{"count":0,"href":"https:\/\/agrilife.org\/texasrowcrops\/wp-json\/wp\/v2\/posts\/1195\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/agrilife.org\/texasrowcrops\/wp-json\/wp\/v2\/media\/1147"}],"wp:attachment":[{"href":"https:\/\/agrilife.org\/texasrowcrops\/wp-json\/wp\/v2\/media?parent=1195"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/agrilife.org\/texasrowcrops\/wp-json\/wp\/v2\/categories?post=1195"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/agrilife.org\/texasrowcrops\/wp-json\/wp\/v2\/tags?post=1195"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}