Below are a few words about peanut post emerge weed control in peanuts from Dr. Eric Prostko.
Here are a couple of quick pics/comments about POST weed control in peanuts based upon research plots that were rated earlier today (June 6). FYI, I did not get any activating moisture for the PRE herbicides for 8-9 days after planting (DAP) due to irrigation system problems. PRE treatments that included Valor still performed very well in this scenario.
Picture #1:
Comments about this picture:
1) No “cracking” herbicides were applied. I prefer to get Cadre out around 30 DAP. Not sand-bagging “cracking” treatments. Gramoxone (paraquat) should be used when needed.
2) My original intention in this test was to just apply Cadre + 2,4-DB + Dual Magnum POST but the lack of a PRE activating moisture event forced me to add some Cobra, especially when PRE’s did not include Valor.
3) If a grower has pigweed and is not sure if it is ALS-resistant or not (most likely will be), it would be a good idea to add either Cobra or Ultra Blazer to the Cadre + DB + Dual Magnum tank-mixture. Other than price (Cobra is more expensive by about ~$5-10/A), no difference between Cobra or Ultra Blazer when pigweeds are small (<3″). But, Cobra would be preferred if pigweeds are bigger.
4) Growers can also use Anthem Flex, Outlook, Warrant, or Zidua instead of Dual Magnum. Anthem Flex will cause more leaf burn because it contains a small amount of Aim (carfentrazone). Here is what that looks like 12 DAT.
Picture #3
Comments about this picture:
1) Despite the lack of a timely rainfall/irrigation event, Valor performed very well.
2) No “cracking” herbicides were applied. I prefer to get Cadre out around 30 DAP. Not sand-bagging “cracking” treatments. Gramoxone (paraquat) should be used when needed.
3) Really no need for an NIS with Dual Magnum or Outlook (EC formulations). But, need NIS when using Anthem Flex or Warrant.
4) Here is what Cadre + Anthem Flex + 2,4-DB + Induce looks like at 6 DAT.
Picture #4
Comments about this picture:
1) Gentle Ben and I (+ Nick Shay, PhD graduate student) put out a quick and dirty test for the control of what we think (?) is spreading dayflower (Commelina diffusa). We will confirm the exact species (with RC from VSU) when we can collect some plants with flowers.
2) These “cracking” treatments looked great at 3 DAT.
3) Did you know that in Georgia there are 6 species of Commelina and 2 species of Murdannia that look very similar?
Commelina benghalensis – Benghal dayflower (formerly tropical spiderwort)
Commelina caroliniana – Carolina dayflower
Commelina communis – Asiatic dayflower
Commelina diffusa – spreading dayflower
Commelina erecta – erect dayflower
Commelina virginica – Virginia dayflower
Murdannia keisak – marsh dayflower
Murdannia nudiflora – doveweed