News From Dan Anco Clemson Peanut Notes No. 117 2023

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Rain and more so warmer temperatures are helping provide conditions needed to move the crop along. Where rains have delayed access to fields or timely fungicide application, including a fungicide with systemic activity against leaf spot helps to add a small amount of “reach back” coverage. While this is not complete eradication, even a little curative activity can be beneficial if applications become delayed. Pages 53-55 in the production guide compare fungicides including relative efficacies. This includes products like Provost Silver, Revytek/Provysol, and Lucento to name a few. For fields with a history of white mold (stem rot), continued days with temperatures 90+ will encourage its development as well.
Hopperburn
Hopperburn shows up as a yellow v-shaped pattern at the tips of peanut leaflets in response to feeding injury by potato leafhopper adults. Hopperburn usually starts along the edge of a field and works its way inward, and because of this sometimes the outer edge of a field can be sprayed rather than the entire field. Treatment threshold is 15 – 20% of leaflets with injury when adults are still present. Leafhoppers are small and move around when disturbed, making their movement easier to see when walking through a field compared to observing the adults when they are still. While available insecticides for leafhoppers are broad spectrum (e.g., pyrethroids, acephate), frequent recent rains decrease the likelihood of an application flaring spider mites.
TSW
Tomato spotted wilt symptoms are varied and become more visible as the season goes on. While management options for TSW are limited to the beginning of the growing season, notes and observations taken now provide context to compare field practices and varieties as an opportunity in advance of considering modifications for next year.
Upcoming Events
Attached is a flyer for a cotton, soybean, and peanut scouting workshop on July 20 in St. Matthews.
At a later date, the peanut field day at Edisto REC in Blackville is scheduled for September 7th.
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

danco@clemson.edu

https://www.clemson.edu/extension/agronomy/peanuts/

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