Postemergence Weed Control Programs

— Written By

I did not have as many trials with programs this year as I normally do. I simply got squeezed on space and had to focus on some of the research we do with company protocols. I have a few cotton trials taking up space and should have those out of the way after this season.

Here are a few images from the trials with complete programs. Some of the treatments are more intense than they need to be. I will make a few comments below each one.

peanut field treated with herbicides

Image 1. This program had a solid PRE herbicide that caused some injury but then was followed up with paraquat at 12 oz/acre plus 1.0 pt/acre Storm.

As always, sometimes the programs that are the most effective can injure peanut. This program had a solid PRE herbicide that caused some injury but then was followed up with paraquat at 12 oz/acre plus 1.0 pt/acre Storm. Paraquat plus Storm has become a very common treatment in the southeastern US. It is very effective but it can injure peanuts. My recommendation has often been paraquat (Gramoxone SL at 8 oz/acre) plus Basagran (16 oz/acre) often applied with more chloroacetamide herbicide. I think we are better waiting to spray the Storm (or Ultra Blazer or Cobra) as a follow up treatment at 1.5 pt (Storm) with 8 or 16 oz 2,4-DB and not mixing with paraquat. Spiking Storm with more Ultra Blazer can help.

But it is hard to argue with the increased control of 12 oz versus 8 oz (paraquat) and the value of acifluorfen in the Storm.

peanut field treated with herbicides

Image 2. This is Warrant PRE followed by Storm (1 pt) plus paraquat (12 oz) early postemergence. Cadre at 4 oz/acre sprayed on this today (this was the treatment for the company). Cadre might not be my first choice as a cleanup treatment due to expense and ALS resistance. Application a week ago with the PPOs would have worked well.

non treated peanut field

Image 3. Non-treated

peanut field treated with herbicides

Image 4.This is Warrant PRE followed by Storm (1 pt) plus paraquat (12 oz) early postemergence. Cadre at 4 oz/acre sprayed on this today (this was the treatment for the company). Cadre might not be my first choice as a cleanup treatment due to expense and ALS resistance. Application a week ago with the PPOs would have worked well.

Article first appeared as North Carolina Peanut Note (PNNC-2014-080)