{"id":582,"date":"2018-06-19T11:13:02","date_gmt":"2018-06-19T15:13:02","guid":{"rendered":"http:\/\/site.extension.uga.edu\/wilcoxcoag\/?p=582"},"modified":"2018-06-21T17:56:03","modified_gmt":"2018-06-21T21:56:03","slug":"row-crop-disease-update-2","status":"publish","type":"post","link":"https:\/\/site.extension.uga.edu\/wilcoxcoag\/2018\/06\/row-crop-disease-update-2\/","title":{"rendered":"Row Crop Disease Update"},"content":{"rendered":"
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Older silks may turn red, but some varieties are red also<\/figcaption><\/figure>\n

Here is our corn in the field. It is silking now and may have less issues than any other crop right now. Sunshine is helping with pollination. Silks come out of the husks over 3 to 5 days. These individual silks continue to grow for about 7 days or until it finds a pollen grain. Once a pollen grain from the tassel lands on a silk (pollination), a pollen tube forms and it takes about 24 hours to grow down the silk to the ovule (fertilization). Then the ovule becomes a kernel.<\/p>\n

Here is a good image Kevin Phillips with Pioneer showed me where the silks are not pollinated if they hang on to the kernel.<\/p>\n

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Silks hanging on to kernel are not yet pollinated. Photo by Kevin Phillips<\/figcaption><\/figure>\n

This time is also very important for kernel development and yield. We don’t need additional stress at this time and during the next 2 weeks. It can reduce the number of kernels per ear.<\/p>\n

Below is an update from UGA Extension Pathologist Dr. Bob Kemerait on diseases in current row crops:<\/p>\n

CORN<\/strong>:\u00a0 No southern rust has been found in Georgia to date.\u00a0 Apparently, there is not a lot in Florida either.\u00a0 Spores from Florida are typically a threat to our corn crop.\u00a0 Little disease there means lower risk here in Georgia.\u00a0 Jason Brock and I are seeing a fair amount of Northern Corn Leaf SPOT, Southern Corn Leaf Blight and some Northern Corn Leaf BLIGHT on samples that have been submitted.\u00a0 To date, most of the disease has been confined to the lower, older leaves and little seems to be aggressively spreading.\u00a0 I am seeing a fair amount of CORN SMUT (Ustilago maydis).\u00a0 This can cause some loss on a susceptible variety, but is often cosmetic.<\/em><\/p>\n

MANAGEMENT for CORN<\/strong>:\u00a0 Still not southern rust, but conditions are perfect.<\/strong>\u00a0 Still not sounding the alarm for fungicide application; however many growers are spraying because 1) conditions are perfect, 2) they are worried about missing it, 3) corn is at tassel or beyond and 4) if we do need to spray quickly it may be tough to line up a plane.\u00a0 Again, I am not calling for general sprays because the rust disease has not been found here and it not rampant in Florida.\u00a0 However, caution is the better part of valor in some situations.<\/em><\/p>\n

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Early Leaf Spot found Tuesday above Pitts<\/figcaption><\/figure>\n

PEANUTS<\/strong>:\u00a0 Still getting reports of Aspergillus Crown Rot in some fields.\u00a0 Often times linked to farmer-saved-seed.\u00a0 Tomato spotted wilt is showing up; it remains to be seen just how bad (or good) it will be this year.\u00a0Conditions are now PERFECT for white mold. Soils are moist and heating up and many are getting afternoon rains.\u00a0 TIMELINESS IS CRITICAL.\u00a0 DO NOT GET BEHIND ON WHITE MOLD OR LEAF SPOT THIS YEAR!<\/em><\/p>\n

Conditions are very favorable for development of peanut leaf spot diseases; reports of leaf spot being found are starting to come in- yesterday from Andrew Sawyer in Wilcox County.<\/em><\/p>\n

COTTON<\/strong>:\u00a0 Bacterial blight was found on NG 5007 in Macon County.\u00a0 Bacterial blight has been reported on DP 1747NR from Irwin County and also Colquitt County.\u00a0 Bacterial blight is reported on PHY 444, DP 1646 and NG 5007 from SW Georgia, thanks Andrew.\u00a0 BOTTOM LINE:\u00a0Conditions have been PERFECT for bacterial blight this year and outbreaks this early are of serious concern.\u00a0 All outbreaks have been on varieties we know to be at least somewhat susceptible.\u00a0\u00a0Noting can be done now about bacterial blight.\u00a0Growers should avoid moving tractors and equipment through those fields when plants are wet.<\/strong><\/em><\/p>\n

COTTON<\/strong>:\u00a0 Significant Fusarium wilt is being reported from Colquitt County.<\/em><\/p>\n

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Fusarium Wilt in Cotton<\/figcaption><\/figure>\n

SOYBEANS<\/strong>: No soybean rust found to date in Georgia.<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

Here is our corn in the field. It is silking now and may have less issues than any other crop right now. Sunshine is helping with pollination. Silks come out of the husks over 3 to 5 days. These individual silks continue to grow for about 7 days or until it finds a pollen grain. […]<\/p>\n","protected":false},"author":227,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[12,3,15,4],"tags":[],"class_list":["post-582","post","type-post","status-publish","format-standard","hentry","category-corn","category-cotton","category-disease","category-peanuts"],"_links":{"self":[{"href":"https:\/\/site.extension.uga.edu\/wilcoxcoag\/wp-json\/wp\/v2\/posts\/582","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/site.extension.uga.edu\/wilcoxcoag\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/site.extension.uga.edu\/wilcoxcoag\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/site.extension.uga.edu\/wilcoxcoag\/wp-json\/wp\/v2\/users\/227"}],"replies":[{"embeddable":true,"href":"https:\/\/site.extension.uga.edu\/wilcoxcoag\/wp-json\/wp\/v2\/comments?post=582"}],"version-history":[{"count":5,"href":"https:\/\/site.extension.uga.edu\/wilcoxcoag\/wp-json\/wp\/v2\/posts\/582\/revisions"}],"predecessor-version":[{"id":625,"href":"https:\/\/site.extension.uga.edu\/wilcoxcoag\/wp-json\/wp\/v2\/posts\/582\/revisions\/625"}],"wp:attachment":[{"href":"https:\/\/site.extension.uga.edu\/wilcoxcoag\/wp-json\/wp\/v2\/media?parent=582"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/site.extension.uga.edu\/wilcoxcoag\/wp-json\/wp\/v2\/categories?post=582"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/site.extension.uga.edu\/wilcoxcoag\/wp-json\/wp\/v2\/tags?post=582"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}