For the Doubting Thomas (Prostko)

Here is a quick picture from my research plots earlier today.  Further proof that herbicides work well when applied on time.  Generally, I do not have any preference for what Group 15 herbicide is used in this EPOST + POST program (Anthem Flex, Dual Magnum, Enversa, Outlook, Warrant, or Zidua).  But, I would prefer that our growers not tank-mix Anthem Flex with Cadre + Cobra + 2,4-DB (POST) at this time (i.e., I need more data).  Also, please keep in mind that these are average prices and prices may be more or less depending upon the grower.  

If you need more info about herbicide mechanisms of action (Groups), check this out from the Weed Science Society of America:

https://wssa.net/wp-content/uploads/WSSA-Mechanism-of-Action.pdf

More Tank-Mix Stuff (Prostko)

 1) Here is a quick picture of a recent peanut tank-mix from JB in Wilcox Co. that was applied without a hitch. I would welcome more pictures from any County Agent of good and bad tank-mixes.  If you send me a tank-mix picture, try to get planting date, application date, and picture date. 

2) Here is an example why conducting meaningful tank-mix research is nearly impossible.  

Grower Tank-Mix Application:

 

My tank-mix application of same treatment: Looks nothing like what grower saw?

3) This ain't starting clean and no way any soil residual herbicide will work on a large, buried pigweed plants!!!! Notice buried stems/roots.  

Palmer Amaranth Control Update (Prostko)

About 2 weeks ago, I put out a small Palmer amaranth control test in Wilcox Co. with John Bennett and Macie Mosteller.  The goal of the test was to investigate potential PPO-resistance.  About 10 minutes after we were done spraying, it rained 0.7".  I went back to the field 2 days later and re-treated in another area of the field.  Here are a few things that we learned:

a) Sometimes the weatherman is correct.  

  

b) Cobra was rain-fast in those 10 minutes (label says 30 minutes) but Gramoxone + Ultra Blazer + Basagran + Dual Magnum was not (need 4 hour rain-free period).  FYI, I have most rain-free periods listed in the comment sections of my various chapters in the 2025 UGA Pest Control Handbook.

c) Applications of Cobra made just 48 hours later were significantly less effective.  In that short time period, average Palmer heights went from 3.54" to 5.05".  Using average heights is NOT a great idea because at both application times 30-50% of the measured plants were larger than the average.

d) Had we and the farmer been in the field 7 days earlier (with no rain), I am certain that a "cracking" application of Gramoxone + Ultra Blazer + Basagran + Dual Magnum would have cleaned up this mess.  TIMELINESS is everything!!!

e) Pretty sure that this population of Palmer amaranth is not PPO-resistant since the 1st application of Cobra was effective.  We also sent some plant samples to the University of Illinois Plant Clinic since they can test for PPO-resistance.  Have not received any results at his time.  

https://extension.illinois.edu/plant-clinic