{"id":516,"date":"2019-07-02T16:37:56","date_gmt":"2019-07-02T20:37:56","guid":{"rendered":"http:\/\/site.extension.uga.edu\/worthag\/?p=516"},"modified":"2019-07-02T16:37:56","modified_gmt":"2019-07-02T20:37:56","slug":"cotton-insect-and-disease-update","status":"publish","type":"post","link":"https:\/\/site.extension.uga.edu\/worthag\/2019\/07\/cotton-insect-and-disease-update\/","title":{"rendered":"Cotton Insect and Disease Update"},"content":{"rendered":"

As we move into July, here are a few things to be looking for in cotton.\u00a0 Much of the earlier planted cotton is blooming and setting bolls.\u00a0 Some cotton fields are still in the seedling and early growth stages.<\/p>\n

\"\"INSECTS <\/strong><\/p>\n

Aphid<\/span> populations have been building in cotton of all sizes and growth stages.\u00a0 Some fields have been treated, and more may require treatment, but hopefully soon the fungus will be “taking out” those that are in cotton fields.<\/p>\n

Another insect that can cause damage to bolls and reduce yield is the stink bug<\/span>.\u00a0 A few years ago, the dynamic threshold was developed to help growers in making treatment decisions.\u00a0 The steps for scouting and the threshold damage levels, based on week of bloom, are shown in the image.\u00a0 This is a great guide to go by when scouting for stink bugs and making treatment decisions.\u00a0 Scouts\/Growers need to be aware of other insect pests that may be present in the field if stink bug treatment is needed.<\/p>\n

\"\"
Silverleaf Whiteflies<\/figcaption><\/figure>\n

While silverleaf whitefly (SLWF)<\/span> has not been an issue to this point in the season, be aware if they are present or not in the field.\u00a0 Their presence will be a factor in the stink bug insecticide decision.\u00a0 If we start seeing SLWF population building, we will notify growers in the area.<\/p>\n

 <\/p>\n

 <\/p>\n

 <\/p>\n

DISEASES <\/strong><\/p>\n

Dr. Bob Kemerait mentioned some foliar diseases that can affect cotton during this time.\u00a0 A couple that may require treatment are target spot and areolate mildew.<\/p>\n

\"Target
Target Spot in Cotton<\/figcaption><\/figure>\n

Target spot<\/span> will usually occur in fields with good growth and yield potential, and warm, humid conditions.\u00a0 Most of the time it begins lower in the canopy and moves its way up in the plant.\u00a0 It can cause premature defoliation when conditions are favorable.\u00a0 The first week of bloom is an excellent time to begin scouting for target spot, as the canopy is closing.\u00a0 If present at first bloom, fungicide treatments can begin.\u00a0 However, if not present, growers can continue to scout for the disease and treat at onset.\u00a0 Based on the research, the single most important timing for fungicide application is at the 3rd week of bloom.\u00a0 More than one application may be needed for continued protection.\u00a0 After the 6th week of bloom, growers should not need to continue protective treatments.<\/p>\n

Another disease that we have seen more the last couple of seasons is areolate mildew<\/span>.\u00a0 This disease looks a lot like powdery mildew, and can be seen higher in the cotton plant.\u00a0 If the cotton is within 4 weeks of anticipated defoliation, it may not need treating; but if it occurs earlier, a timely fungicide application can protect potential yield.<\/p>\n

Here are some tips from Dr. Kemerait<\/em>:<\/p>\n

Because of crop development, it is important during July to consider protecting a cotton crop with fungicides.\u00a0 There are 5 steps.\u00a0 First<\/strong><\/span>, scout the field and determine what diseases are present.\u00a0 Second<\/strong><\/span>, decide on management options.\u00a0 If the disease is Stemphylium leaf spot, then a fungicide will not control the disease.\u00a0 If the disease is target spot or areolate mildew, then a fungicide could be beneficial.\u00a0 Third<\/span><\/strong>, consider the crop before applying the fungicide.\u00a0 Does the field have a reasonable chance for good yields?\u00a0 How advanced is the disease?\u00a0 Fourth<\/span><\/strong>, decide on a fungicide.\u00a0 Priaxor is the best fungicide for management of target spot, though other fungicides, to include Headline and Quadris are also good.\u00a0 These fungicides will control areolate mildew as well, though areolate mildew is easier to control than is target spot.\u00a0 Fifth<\/span><\/strong>, timing of fungicide application is critical.\u00a0 If applied too late, there will be little hope for controlling the disease and protecting yield.<\/p>\n

Please contact Worth County Extension if we can be of assistance.<\/p>\n","protected":false},"excerpt":{"rendered":"

As we move into July, here are a few things to be looking for in cotton.\u00a0 Much of the earlier planted cotton is blooming and setting bolls.\u00a0 Some cotton fields are still in the seedling and early growth stages. INSECTS Aphid populations have been building in cotton of all sizes and growth stages.\u00a0 Some fields […]<\/p>\n","protected":false},"author":276,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11,5,24,6],"tags":[],"class_list":["post-516","post","type-post","status-publish","format-standard","hentry","category-cotton","category-entomology","category-insects","category-plant-pathology"],"_links":{"self":[{"href":"https:\/\/site.extension.uga.edu\/worthag\/wp-json\/wp\/v2\/posts\/516","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/site.extension.uga.edu\/worthag\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/site.extension.uga.edu\/worthag\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/site.extension.uga.edu\/worthag\/wp-json\/wp\/v2\/users\/276"}],"replies":[{"embeddable":true,"href":"https:\/\/site.extension.uga.edu\/worthag\/wp-json\/wp\/v2\/comments?post=516"}],"version-history":[{"count":1,"href":"https:\/\/site.extension.uga.edu\/worthag\/wp-json\/wp\/v2\/posts\/516\/revisions"}],"predecessor-version":[{"id":521,"href":"https:\/\/site.extension.uga.edu\/worthag\/wp-json\/wp\/v2\/posts\/516\/revisions\/521"}],"wp:attachment":[{"href":"https:\/\/site.extension.uga.edu\/worthag\/wp-json\/wp\/v2\/media?parent=516"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/site.extension.uga.edu\/worthag\/wp-json\/wp\/v2\/categories?post=516"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/site.extension.uga.edu\/worthag\/wp-json\/wp\/v2\/tags?post=516"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}