Anco Clemson PGR and Molybdenum Peanut Notes No. 124 2022

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Growth regulator timing
For varieties with a prolific canopy growth pattern in fields and years that support a large canopy, the target recommended timing for the first application of growth regulator (Apogee/Kudos) is when 50% of the laterals are touching in the row middles. When weather or other factors interfere with making the application on time, it is better for growth regulator to be a few days late rather than being a few days early. The goal with the growth regulator is to prevent excessive canopy/vine growth, but at the same time we want the crop to be able to close the rows to increase its area for photosynthesis and to shade out weeds. This strategy is the reverse of how we would like to approach fungicide applications. For diseases, we get better control when we can prevent infections, which benefits from erring on the early side.
Do we need to add molybdenum (Mo) in our micronutrient sprays? More than likely we do not. While molybdenum is an important element that is used by the bacteria in the nodules (on the roots) to fix nitrogen, molybdenum deficiency is very rare in SC and is associated with strongly acidic soils where the pH is around 5.5 or less. If soils were adequately limed (pH > 5.8) or if the pH was already suitable for peanut, molybdenum deficiency should not be a primary concern. If a micronutrient product happens to already contain Mo and does not cost more than a similar product without the Mo (if looking to apply Boron, for example), the additional Mo should not cause a problem. If adding a new product in a combination, it is a good general practice to test mixing compatibility in a jar. Nodules can be checked for healthy activity by cutting them open. Red or pink inside the nodule indicates it is healthy and active. A white interior indicates the nodule is inactive.


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