Leaf Spot in South Carolina Dan Anco Peanut Notes No. 170 2025

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Late leaf spot lesions with active sporulation have been identified by James Thomas in Bamberg County and close to Barnwell County on both Virginia type peanut and on Georgia 16HO. This is in lapped fields that have a history of elevated leaf spot pressure and infection in previous years. Encouragingly, the number of lesions found so far has been less than what has been found in previous years. The field is under management with a full and effective fungicide program, with no extended intervals, that includes a good mix of Bravo, Bravo plus Alto, Provost Silver plus Miravis, and Bravo plus Elatus.

Several parts of the state may receive additional rain this week. Where a fungicide application might be delayed a couple days due to possible rain, it is better to come in a few days early in advance of the rain, where feasible, to maintain coverage and protection. This is particularly important for fields with a history of leaf spot pressure, where a susceptible variety is planted, and where rotation is not greater than two years between peanut crops.

As much as possible, being timely with our fungicide applications now will maintain the health of the crop going into harvest later on. This can provide needed flexibility as digging and combine operations later come to pass.

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