There have been a lot of phone calls in the past few days with folks concerned about POST applied herbicide tankmix burn on cotton and soybeans. We see burn from POST applied tankmixtures every spring but the crop response from applications over the past 10 days has been more pronounced. Continue reading
There have been a few reports of good sized (>12”) horseweed (marestail) putting on significant new growth after an Engenia or Xtendimax application. Though these occurrences have been relatively few they are a concern as the horseweed appears to be growing back with a vengeance (Picture right).
As we go into the double crop soybean planting stretch these reports are a good reminder to apply a good burndown on horseweed prior to even Xtend soybeans emerging. Continue reading
I blogged several weeks back on the poor Palmer amaranth control with Engenia in a field in Fayette County. We followed up by applying another application of Engenia on the still green Palmer 14 days after the first application. I am glad to report that all the Palmer amaranth were controlled 14 days after the second Engenia application. Continue reading
The question of the week is will the Palmer amaranth die that is still green after an Engenia or Xtendimax application? The situation is that many pigweeds in some fields have not grown after an Engenia or Xtendimax application but still remain green going on 10 days or more after the application. The question is will these pigweeds start to regrow? Continue reading
The very wet May has led to rapid degradation of the PRE applied herbicides in cotton. In our tests at Jackson that were planted 21 days ago all the PRE applied herbicides have broken. Some broke very quickly after application while others held on a little better, even with all the rain. Continue reading
There have been some Gramoxone burndown applications that have left some Palmer amaranth survivors. This happens to some extent every year. The cause of the problem is almost always coverage. Continue reading
The blog on inconsistent dicamba performance on Palmer amaranth has caused some follow up questions.
Is there any difference between Engenia, Xtendimax and Clarity for actual Palmer amaranth control? NO. I know from repeated research with all three that they all perform fairly well on a 1 to 4” Palmer amaranth. They all often need follow up applications on Palmer that is larger than 4”.
Are PRE applied herbicides needed in Xtend soybeans? YES. The folks to date who have had issues with dicamba performance were not using any PRE applied herbicides. It is hard to get good coverage in those thick mats of pigweeds where PREs have not been used.
In a March blog I noted the lack of horseweed (marestail) in many fields but thought an April germination event of this weed could come late to the party and pose a problem. On occasion I make a good guess, as that has clearly been the case. Continue reading