Thrips Management Peanut Notes No. 40 2022

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We are looking to improve early season thrips control this season.

CURRENT: Historically we use 3/4 # Acephate and 11 oz Imidacloprid at plant.

Then, we spray 3/4 # Acephate, most of the time because of thrips issues, around 15-25 DAP.

PROPOSED CHANGE: This year, we are looking at replacing this program with 6# of Thimet at plant.

What are your thoughts on this?

Will it give us enough control to eliminate the after plant spray that often coincides with Gramoxone/Dual/Basagran?

We’ve been hesitant to put Acephate in the same tank mix because it makes it so hot and if we are spraying Acephate then there is already thrips damage there.

We’ve not used Thimet in over 10 years and would be going with the Lock n Load system.

Thank you for your guidance


I have copied Rick Brandenburg as well. I think a transition from what you have been using in the seed furrow to phorate (Thimet) is potentially a good move. We have seen acephate in the seed furrow delay peanut emergence on occasion. We generally do not recommend acephate in the seed furrow and point growers to the other options (AgLogic, Thimet, and imidacloprid). In recent years imidacloprid has not performed as well as it did 5 to 10 years ago. We don’t know the mechanism for sure but there is likely resistance to this chemistry in thrips populations. It’s not an issue everywhere but it is a problem in some places.

The rate of the Thimet 20G formulation would be 5 pounds product/acre. You do have to be careful with Thimet in sandy fields with low organic matter, especially if the rate is higher than 5 pounds per acre.

It is hard to predict if you will need to add acephate with your early postemergence herbicide sprays. From year to year we see variation. When we do surveys at grower meetings, between 50 and 60% of growers apply acephate no matter what they used in the seed furrow. But, I think you will have a better chance of not needing acephate across a lot of acres if you use Thimet rather than imidacloprid. The acephate in the seed furrow improves control with imidacloprid but I still worry about delays in emergence.

I think if you have a considerable amount of injury from thrips, when you spray paraquat plus other products (with or without acephate), you can get a significant yield hit (600-900 pounds per acre in some of our trials from years ago.) Peanuts can’t take both thrips injury and paraquat injury. Depending on when you spray the paraquat you can easily be a week behind when the acephate should be sprayed, but I think with Thimet you will get better control (well, more consistent control) than imidacloprid. Although very expensive, AgLogic performs really well and would likely give you even greater flexibility and in many cases would decrease the need for acephate.

I’ve attached images from the peanut meetings showing thrips injury that creates too much risk for paraquat to be applied. But, I have not seen acephate heat up paraquat per se. I think the issue is there is too much injury from thrips already there in many cases, and the paraquat just hammers the peanuts before the acephate can help on thrips control.

Hope this helps. Let me know if any clarification is needed.

Follow up:

This is excellent, thank you very much for your help here!


Sorry, I have been tied up in day long meetings in Washington DC this week. The good news is that Dr. Jordan hit the nail on the head with his response. Very thorough and very accurate. I have nothing to add. Thank you David!

Paraquat and Thrips Injury