Dan Anco Clemson Comments Peanut Notes No. 143 2025

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The following are recent comments from Dan Anco at Clemson.

Coming into July, much of the crop ranges in age from about close to a month old to 50 to 70 days old. More than a third of the crop is pegging. After having some drier weather, an increased likelihood of rain is coming back into the forecast through the weekend and into the week ahead.

Growth Regulator Timing

As rows begin to close and fields are considered for growth regulator application (for example, rank Virginias or twin row runners with prolific vine growth), our recommended timing is when 50% of laterals are touching in the row middles. Following a first application at 50% laterals touching, a second application may be considered after about two weeks if new canopy growth becomes visible and growing conditions are favorable for further rank growth.

Runner Gypsum

If a field of runner peanut such as Georgia 16HO received about 1200 lb/A gypsum, I would be comfortable with this amount not needing to receive additional gypsum, barring the field receiving heavy rains over a short period of time that could remove what was spread. Depending on soil test levels and if the field is grown for seed production, our standard recommendation ranges from 1000 to 1500 lb/A.

Benefit to N Application?

A couple questions came up about applying N fertilizer to peanut. When a field has been effectively inoculated at planting and is not showing signs of N deficiency, I do not have data, nor have seen data, to support an economic benefit to the application of additional N fertilizer.

Upcoming Field Days in 2025

    • July 10 – Edisto REC Watermelon Field Day (contact is Bhupinder Jatana)
    • July 15-16 – Pee Dee Tobacco Field Day (contact is William Hardee)
    • July 22 – Pee Dee REC Corn/Soybean Field Day (contact is Michael Plumblee)
    • July 24 – Edisto REC Corn/Soybean Field Day (contact is Michael Plumblee)
    • July 25 – Baruch Behind the Gate event (contact is Jim Anderson)
    • Aug 28 – Pee Dee REC Agronomy Field Day (contact is Jane Dever)
    • Sep 4 – Edisto REC Peanut/Cotton Field Day (contact is Dan Anco)
    • Oct 14 – Graduate Research Symposium at Edisto (contact is Summer Chandler
      Boron and Manganese sifficiency levels and application guidelines from the production guide.
Boron (B) 0.5 lb/A If soil B is < 0.4 lb, apply 0.3 – 0.5 lb B/A (1.5 – 2.5 lb Solubor) as a foliar spray in the first fungicide application. Avoid toxicity from excessive B application.
Manganese (Mn) pH Mn lb/A
5.8 6
5.9 7
6.0 8
6.1 9
6.2 10
6.3 10.5
6.4 11
6.5 12
If soil test Mn is below the sufficiency value at the current pH or the target pH when lime is to be applied, apply 0.5 lb Mn (2 lb manganese sulfate 25%, 1.5 lb Tecmangam, or 1.5 lb ManGro DF 31%) with both the 60 and 75 DAP fungicide applications. For pH values above those shown, the Mn sufficiency soil test value is 1 lb higher for each additional 0.1 of a pH unit.
Row closure versus laterals touching.
Peanut recovery after paraquat, 2 days, 5 days and 7 days after. Showing growth and increased greening.
Dan Anco

Extension Peanut Specialist and Associate Professor

danco@clemson.edu

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