Granular and Liquid Formulations of Chlorpyrifos Peanut Notes No. 46 2024
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Collapse ▲Years ago, Rick and Ames Herbert reported that liquid Lorsban incorporated in soil at a shallow depth suppressed southern corn rootworm as well as pegging applications. See this article:
Brandenburg, R.L. and D.A. Herbert. 1991. Effect of timing on prophylactic treatments for southern corn rootworm (Coleoptera: Chrysomelidae) in peanut. Journal of Economic Entomology. 80:1894-1898.
Rick and I conducted trials that looked at incorporating Lorsban along with herbicides that are typically used in peanuts immediately prior to planting. We also had other preemergence and postemergence herbicides. The goal, in addition to seeing how effective the application was on southern corn rootworm, was to see if the presence of chlorpyrifos increased herbicide injury. In this study, Lorsban was less effective when incorporated throughout the soil profile than granular Lorsban applied at pegging. This makes sense. In the more recent work, the insecticide was incorporated throughout the soil profile and likely had a less than adequate concentration (and level of uniformity) to suppress southern corn rootworm. See the article below.
Jordan, D.L., R.L. Brandenburg, P.D. Johnson, B.M. Royals, and B. Watson. 2008. Interactions of chlorpyrifos and herbicides applied to peanut (Arachis hypogaea L.). Peanut Science. 35:32-37.
I think the take-home message is that most folks are not going to apply this product on a band (or broadcast) and then lightly incorporate it in the pegging zone (and prevent soil movement of non-treated soil into the pegging zone.) Our data suggest that if you are not going to do it this way (shallow incorporation), do not waste time and money with a traditional preplant incorporated application that we often use for herbicides.
DO NOT APPLY LIQUID CHLORPYRIFOS TO EMERGED PEANUTS!
Chlorpyrifos will not be labeled for use in peanuts in any form in 2025. The label change is primarily designed to use up existing stocks of insecticide, especially stocks that are present on farm.