Dan Anco Comments Clemson Peanut Notes No. 100 2025

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The following information was provided by Dan Anco at Clemson University.


Postemergence Thrips 
I was asked this week on the choice of foliar acephate compared to foliar imidacloprid for post emergence thrips management on peanut approximately 30 days old. Between these two, I recommend acephate. We have more data and experience with its efficacy and have not recorded instances of thrips resistance or insensitivity to it in SC, and for context, the foliar rate of many of the imidacloprid products labeled for soil and foliar use on peanut has only about 10% of the soil rate being allowable for the foliar rate.
White Mold

Our traditional critical period for white mold fungicide control has characteristically begun around 60 DAP. Under years where weather conditions during earlier portions of the season are conducive to its development, we have seen benefits to including effective products during earlier application timings (e.g., 45 to 30 DAP). In the attached pictures, a seedling with mycelium of the white mold fungus can be seen. Also attached are slides from work we conducted looking at different fungicides for white mold management.

Calcium

A question came up about whether or not application of land plaster would be recommended for runner fields where soil Ca test levels were in the 700 to 900 lb/A range. My response was that if there is irrigation and/or timely rains, depending on the runner cultivar it could be alright, but that can be a big “if” we would need to be comfortable with. We did one trial last year where we had about 890 lb/A soil preplant Ca with 06G and we did not have a yield loss in that test where we did not apply land plaster. That is one year and we are looking to repeat that test this year, but last year that test did receive timely rains during pod fill which helped with soil Ca availability. I like to err on the side of caution given the many variables and generally like to see (at least some) land plaster being applied (unless it is smaller runners [seed size 650/lb or less] on soil levels around 900 or above). In 2019, which was a stressful drought/hot year, a farmer nearby had 06G next to 297 in a field, and the 297 went Seg III whereas the 06G with its smaller pod size did not. I don’t know what the baseline soil Ca levels were in that field, but the entire field did receive a standard rate of land plaster. I mention this as an example of how under certain weather conditions or growing seasons we can see differences among runner cultivars.

David Jordan, NC State, recently shared information comparing Ca amounts of gypsum to a liquid calcium product and application timing. Virginia types have larger pods, leading to an increased calcium requirement, and are more predominant in NC, but many of the principles overlap.

Peanut images 6-4-25

WM slides

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

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