As the combines cut corn they are often leaving behind a very green field of Palmer amaranth (Picture right). It is not uncommon to find that areas of fields where the corn died early from drought stress have 3 to 6’ tall Palmer in them just now rolling into flowering. These pigweed need to be destroyed as soon as possible. Continue reading
The drought of 2012 is shaping up to be one of those widespread tough ones no one forgets, like 1983 or 1988. Hopefully, we will get a good general rain here shortly. This drought has been the source of calls from frustrated folks who are still trying to control Palmer amaranth. The question has been asked should I discontinue weed control with the yield potential of my crops going down every day. Continue reading
Dear Colleagues
Just a quick reminder that The University of Tennessee Weed Tour will be next Thursday, June 21 at the West Tennessee Research & Education Center in Jackson, TN. Registration will start at 8:30 A.M. and the tour will begin at 9:00 A.M.. Continue reading
Weed control has become very expensive in many cotton fields. I walked into a number of cotton fields, last week, that from the first burndown to date have close to $100/A in herbicide already applied. Unfortunately, some are not done yet. Part of the issue is the poor residual control in some fields from non-activated post-applied Dual or Warrant(Picture Left). Another issue is in some fields 2 to 6” Palmer amaranth is regrowing after Liberty applications. Continue reading
There have been several more reports of glyphosate-resistant (GR) Palmer amaranth being found in East Tennessee. In some cases it is being found for the first time in new areas of counties already known to have GR Palmer. In other case it is being found for the first time in a county (Coffee County). Continue reading
There has been a number of reports of poor Palmer amaranth control with post applications of PPO herbicides (Flexstar, Cobra, etc). This is not new to this year. However what is being reported more as a problem this year than last is even 1 to 2” Palmer is often recovering from these post PPO applications. Continue reading
This is now a critical time for Palmer amaranth control in soybean. Despite most of Tennessee being very dry, Palmer amaranth is growing very quickly with the warm temps. Continue reading
Does time of day have an influence on how well Liberty controls Palmer amaranth? That is a question we had as a result of some field observations last year. Typically we see good control of Palmer pigweed that is less than 6 inches tall with Liberty. However, from time to time we have noted inconsistent control of Palmer pigweed greater than 6 inches tall where time of application seem to be the only difference. Continue reading