Disease, Heat Units and Crop Development in South Carolina Dan Anco Peanut Notes No. 186

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Much of the state is forecast to receive rain for what looks like nearly every day over the coming week. If a window of opportunity opens to apply fungicide a few days earlier than originally planned, this can help to avoid a delay in operations when wet canopies can promote leaf spot development.
Attached pictures include white mold/stem rot on untreated dryland Georgia 06G and late leaf spot on (irrigated) Emery peanut. Reports of fungal disease have been fairly tempered, save for a handful of fields near areas that have had yearly high disease pressure.
Planting having been accomplished over a range of dates, most fields now range between 75 (May 31) and 120 (April 20) days old. Many good products are available for use at these times. As we manage into the later portion of the growing season, chlorothalonil and teb is a trusty standby that continues to be a good choice. Provost Silver is another option that has performed well across many environments, and its application with most sulfur products (e.g., Microthiol Disperss) can further bolster effectiveness. Chlorothalonil plus Topsin (plus teb) is another option that won’t break the bank but can add systemic activity to protectant bravo.
The last picture was taken from a field of Sullivan peanut in Bamberg County. The season for blasting pods is upon the earlier planted crop, and not far away for others.
Based on the below degree day values across South Carolina, 2022 has more heat units compared to 2021 during the same time (approximately 14 “days with average temp 75F” ahead) and is still a touch above (approx. 6 “days” of 75F-average temps) the average amount from 2015 through 2019. These estimates are generally helpful information for context, and ground-truthing through pod blasting actual fields continues to be our friend.
Degree-day accumulation (base 56F) from May 1 through August 13 across locations in South Carolina.
Location 5 yr average (2015-2019) cDD 2021 cDD 2022 cDD
Orangeburg 2382 2195 2434
Florence 2466 2236 2596
SRS near Augusta 2280 2087 2445
near Jefferson 2267 2056 2361

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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