Acephate Resistance in Cotton in NC Confirmed Peanut Notes No. 89 2023

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The following information modified from an e-mail sent to NC State Extension agents on June 5
Dominic Reisig posted information on populations of thrips that have confirmed resistance to acephate (multiple trade names, but Orthene is the most commonly used tradename.) As you know, this insecticide is used routinely to control thrips in peanuts. It is our “go to” insecticide. Based on surveys, we spray acephate on well over half our acres of peanuts in most years.
To my knowledge, there have been no reports of an acephate failure in peanuts. However, there has been tremendous selection pressure for resistance to this insect over the years across peanut counties when you combine use patterns in cotton and peanuts.
For better or worse, my mind thinks of Palmer amaranth resistance to herbicides when I think of this topic. The magnitude and pace of resistance we observed and experienced with this weed was alarming. However, that model is not the case for all weeds and certainly not the cased for pests other than weeds. The mobility of thrips and the number of “selection events” that occur will influence the magnitude of this issue.
In addition to acephate, Baythroid XL, Brigade, and Radiant SC are listed in 2023 Peanut Information for foliar suppression of thrips in peanuts.
I suspect a great deal of acephate has already been applied to peanuts with likely more going out in the next 2 weeks. Our temperatures and the slow growth of peanuts this spring might push the need for thrips sprays well into June.
We will provide more information on thrips control on the Peanut Extension portal in the coming days. Please take a look at Dominic’s article on the Cotton Extension portal for more details on the acephate-resistance confirmation.