{"id":1617,"date":"2016-02-25T09:20:02","date_gmt":"2016-02-25T14:20:02","guid":{"rendered":"http:\/\/site.extension.uga.edu\/applingcrop\/?p=1617"},"modified":"2016-02-25T20:37:50","modified_gmt":"2016-02-26T01:37:50","slug":"problems-in-oats","status":"publish","type":"post","link":"https:\/\/site.extension.uga.edu\/applingcrop\/2016\/02\/problems-in-oats\/","title":{"rendered":"Problems in Oats and Forages"},"content":{"rendered":"

I’ve looked at some oats in our area\u00a0and received calls\u00a0about fields turning a red\u00a0to purple color. Reddening in oats can be the result of several unrelated actions. In most cases, the\u00a0color expression is due to a group of\u00a0sugar free\u00a0pigments called anthocyanidins. According to Dr. Dewey Lee, when there is an increase in free sugars in a leaf, these anthocyanidins convert to anthocyanins which give the leaf a red color. \u00a0In oats this can occur due to such things as shifts in temperature from warm to cold, stress from acid soils, infections from pathogens, deficiencies in phosphorus, lack of nitrogen, water logged soils that reduce oxygen levels, etc. \u00a0All of these problems generally result in a shift \u00a0or reduction\u00a0of photosynthesis which can lead to sugar or carbohydrate production\u00a0that is not readily used in growth which then begin to accumulate in the plant cells increasing the production of the pigment.<\/p>\n

\"IMG_8135\"<\/a><\/p>\n

Because the color expression can originate from several actions, it is best to look at all the reasons and see which one is most reasonable.<\/p>\n

This time of the year the discoloring can be due to one or more of the following:<\/p>\n

-Cold weather<\/p>\n

-Barley yellow dwarf virus\u00a0(you will see feeding wounds and aphid carcasses scattered over the field)<\/p>\n

\"IMG_8136\"<\/a><\/p>\n

-Low soil pH<\/p>\n

-Variation in nitrogen content<\/p>\n

-Possibly\u00a0low P content<\/p>\n

Usually the problem is caused by cold weather.<\/p>\n

\"Notice<\/a>
Notice that the oats are not discolored under the tree line. They were protected from frost injury.<\/figcaption><\/figure>\n

What should you do? If you haven’t applied addition nitrogen,\u00a0it would be a good idea to go ahead as soon\u00a0as you can get in the field.<\/p>\n

\"Obviously,<\/a>
Obviously, you can’t get into some fields right now unless you have an airboat.<\/figcaption><\/figure>\n

The total N required for oats following peanuts is 60 pounds per acre; for oats following cotton, corn, etc. 80 pounds of\u00a0nitrogen is required; and\u00a0for oats following grain sorghum apply 100 pounds nitrogen per acre for the season. Assuming you applied nitrogen\u00a0in the fall and depending on which crop the oats are following, \u00a0an additional 20 to 40 pounds would be recommended.<\/p>\n

If you did not take a soil sample prior to planting, that’s always a good place to start when troubleshooting. Plant tissue samples are also a good tool to use to pinpoint possible nutrient deficiencies.<\/p>\n

Herbicides<\/strong><\/p>\n

Some herbicide applications in small grains are not working well. The ideal temperatures for applying most POST herbicides are between 65 and 85 F. Weeds may be killed slowly below 60 F.<\/p>\n

\"Presentation1\"<\/a><\/p>\n

2,4-D alone does not adequately control chickweed and henbit. Mixtures with Harmony or Express are advised for these weeds.<\/p>\n

\"Not<\/a>
Not the ideal\u00a0conditions for 2,4-D applications!<\/figcaption><\/figure>\n

Disease<\/strong><\/p>\n

I am finding a little bit of rust in some oats. The optimum temperature for spore germination is 68 degrees F. Dry, windy days, followed by cool nights with dew, favor leaf rust epidemics. If oats are being grown for grain, a fungicide may be a good idea where rust is found.<\/p>\n

Triazoles are a good early curative fungicide. Strobilurins are good protectants and will last longer on the plant. Usually one single application would suffice, but\u00a0check the plant at early flag leaf stage to evaluate the disease situation.<\/p>\n

 <\/p>\n

\"IMG_8138\"<\/a><\/p>\n

 <\/p>\n

NOTE:<\/strong> The use of brand names does not imply endorsement of the products or criticism of similar ones not mentioned.<\/em><\/p>\n

 <\/p>\n

 <\/p>\n

 <\/p>\n

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

I’ve looked at some oats in our area\u00a0and received calls\u00a0about fields turning a red\u00a0to purple color. Reddening in oats can be the result of several unrelated actions. In most cases, the\u00a0color expression is due to a group of\u00a0sugar free\u00a0pigments called anthocyanidins. According to Dr. Dewey Lee, when there is an increase in free sugars in […]<\/p>\n","protected":false},"author":217,"featured_media":1619,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[18],"tags":[],"class_list":["post-1617","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-forages"],"_links":{"self":[{"href":"https:\/\/site.extension.uga.edu\/applingcrop\/wp-json\/wp\/v2\/posts\/1617","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/site.extension.uga.edu\/applingcrop\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/site.extension.uga.edu\/applingcrop\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/site.extension.uga.edu\/applingcrop\/wp-json\/wp\/v2\/users\/217"}],"replies":[{"embeddable":true,"href":"https:\/\/site.extension.uga.edu\/applingcrop\/wp-json\/wp\/v2\/comments?post=1617"}],"version-history":[{"count":10,"href":"https:\/\/site.extension.uga.edu\/applingcrop\/wp-json\/wp\/v2\/posts\/1617\/revisions"}],"predecessor-version":[{"id":1669,"href":"https:\/\/site.extension.uga.edu\/applingcrop\/wp-json\/wp\/v2\/posts\/1617\/revisions\/1669"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/site.extension.uga.edu\/applingcrop\/wp-json\/wp\/v2\/media\/1619"}],"wp:attachment":[{"href":"https:\/\/site.extension.uga.edu\/applingcrop\/wp-json\/wp\/v2\/media?parent=1617"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/site.extension.uga.edu\/applingcrop\/wp-json\/wp\/v2\/categories?post=1617"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/site.extension.uga.edu\/applingcrop\/wp-json\/wp\/v2\/tags?post=1617"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}