{"id":138,"date":"2018-08-07T15:35:17","date_gmt":"2018-08-07T19:35:17","guid":{"rendered":"http:\/\/site.extension.uga.edu\/benhillcoag\/?p=138"},"modified":"2018-08-07T15:35:17","modified_gmt":"2018-08-07T19:35:17","slug":"grass-control-reductions-in-peanut-in-2018","status":"publish","type":"post","link":"https:\/\/site.extension.uga.edu\/benhillcoag\/2018\/08\/grass-control-reductions-in-peanut-in-2018\/","title":{"rendered":"Grass Control Reductions in Peanut in 2018?"},"content":{"rendered":"

Reductions in Grass Control in 2018? (Prostko)<\/a><\/h3>\n
\n
<\/div>\n<\/div>\n
Getting plenty of calls about perceived reductions in grass control after applications of ACC-ase inhibiting herbicides, such as Select (clethodim) or Poast (sethoxydim), have been applied.\u00a0 Some folks first reaction to this “lack” of control is that we suddenly have widespread ACC-ase resistance.\u00a0 When its comes to the issue of resistance, I will never say never.\u00a0 But, before traveling down that bumpy road, I would like for you and your growers to consider the following:<\/p>\n

1) Currently, only 2 grass species have been “officially” confirmed to have evolved ACC-ase resistance in Georgia including large crabgrass and Italian ryegrass. Scientific confirmation of herbicide resistance takes lots of time, manpower, and greenhouse space.<\/p>\n

2) Labeled heights for optimum control of various common grasses with Select, including crabgrass, Texas panicum crowfootgrass, and goosegrass, are\u00a02″- 6″<\/u><\/i><\/b>.<\/p>\n

3) The following is some data illustrating the effect of Select rate and timing on the control of goosegrass.\u00a0 Please note that goosegrass control was reduced by 16-23%, depending upon rate, when applied at the 4-6 tiller stage of growth.<\/p>\n\n\n\n\n
<\/a><\/td>\n<\/tr>\n
Figure 1.\u00a0 Goosegrass control with Select applied at different rates and timings.<\/b><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

4) If Cadre (imazapic) was applied prior to the grass herbicide application, it is very likely that grass control will be reduced.\u00a0 \u00a0Research has shown that Cadre can reduce the photosynthetic rate of goosegrass which then reduces the sensitivity of the ACC-ase enzyme to clethodim (Burke and Wilcut.\u00a0 2003.\u00a0 Physiological basis for antagonism of clethodim by imazapic on goosegrass.\u00a0 Pesticide Biochemistry & Physiology)<\/p>\n

5) At this time of the year, peanut plants are kinda tall (> 12″).\u00a0 Thus, any grass plants peaking out of the top of the peanut canopy are not likely to be adequately controlled due to size and coverage issues.<\/p>\n

6) Before dropping the R-bomb, please double-check use rates, stages of growth, adjuvants, rain-free periods, and field history.\u00a0 The threat of herbicide resistance is definitely real but it does not happen in one night.<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"

Reductions in Grass Control in 2018? (Prostko) Getting plenty of calls about perceived reductions in grass control after applications of ACC-ase inhibiting herbicides, such as Select (clethodim) or Poast (sethoxydim), have been applied.\u00a0 Some folks first reaction to this “lack” of control is that we suddenly have widespread ACC-ase resistance.\u00a0 When its comes to the […]<\/p>\n","protected":false},"author":234,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[15,19],"tags":[],"class_list":["post-138","post","type-post","status-publish","format-standard","hentry","category-peanuts","category-weeds"],"_links":{"self":[{"href":"https:\/\/site.extension.uga.edu\/benhillcoag\/wp-json\/wp\/v2\/posts\/138","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/site.extension.uga.edu\/benhillcoag\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/site.extension.uga.edu\/benhillcoag\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/site.extension.uga.edu\/benhillcoag\/wp-json\/wp\/v2\/users\/234"}],"replies":[{"embeddable":true,"href":"https:\/\/site.extension.uga.edu\/benhillcoag\/wp-json\/wp\/v2\/comments?post=138"}],"version-history":[{"count":1,"href":"https:\/\/site.extension.uga.edu\/benhillcoag\/wp-json\/wp\/v2\/posts\/138\/revisions"}],"predecessor-version":[{"id":139,"href":"https:\/\/site.extension.uga.edu\/benhillcoag\/wp-json\/wp\/v2\/posts\/138\/revisions\/139"}],"wp:attachment":[{"href":"https:\/\/site.extension.uga.edu\/benhillcoag\/wp-json\/wp\/v2\/media?parent=138"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/site.extension.uga.edu\/benhillcoag\/wp-json\/wp\/v2\/categories?post=138"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/site.extension.uga.edu\/benhillcoag\/wp-json\/wp\/v2\/tags?post=138"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}