Dan Anco Comments Spider Mites Peanut Notes No. 183 2023

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A peanut field with spider mites has been confirmed by Eric Markwell of Hemigway Peanut in Horry County earlier this week. Most areas of the state have received ample rainfall to reduce the likelihood of flaring spider mites, though each field is different. This is a timely reminder to exercise judicious caution when considering potential broad-spectrum insecticide applications such as pyrethroids, if insects such as worms or leafhoppers are the initial pest of concern in a field. Managing spider mites can be expensive (though less expensive than not managing them), but if an application is warranted, increasing the application volume towards 20 gallons/acre would be worthwhile to improve coverage. Portal is generally considered to be more effective than Comite/Omite in part since it has activity against all life stages. While we have not collected data on it, in other systems micronized sulfur has been reported to have activity against the two-spotted spider mite as well. However, in the lack of response-application efficacy data in peanut, I would in the meantime consider sulfur’s activity to be a preventative bonus if it were already being used for fungicide combination purposes as a value-added feature. Rain/irrigation is generally considered to be the best remedy.

Dan Anco

Extension Peanut Specialist and Associate Professor

Department of Plant and Environmental Sciences

Clemson University – Edisto Research and Education Center

64 Research Road

Blackville, SC 29817

630-207-4926 cell



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