Dan Anco Comments Clemson May 24 Peanut Notes No. 75 2021

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LLS on Volunteers
Limited late leaf spot lesions have been found on a few susceptible volunteers from fields that have had severe infections and heavy digging losses last year. Whenever possible, peanut volunteers should be put under the ban and destroyed. Liberty is extremely effective in terminating them. Efficacy of other herbicides are listed in the production guide. Early in the season, tillage or cultivators can also be effective at mechanical removal/burying. Peanut with volunteers nearby benefit from an in-furrow product that contributes leaf spot control and timely fungicide coverage. Use of a fungicide with systemic activity becomes beneficial if spores have been around for a while or if a spray gets delayed, or later in the growing season when large canopy growth limits spray penetration.
Thrips Insecticide Absorption
Much of the earlier peanuts I have seen or heard of in the state seem to have had reasonably ample moisture at planting to help with insecticide uptake. Those that went into marginal soil moisture are at greater risk for poor uptake, increasing risk of economic thrips injury. A postemergence application of acephate is inexpensive insurance to protect against thrips injury and/or limited in-furrow insecticide absorption. The amount of thrips injury on dryland planted peanut in the attached pictures is modest, but both of those fields had moisture at planting due to recent rain. Not all fields could say the same. Additional comments on the timing of acephate and/or herbicide applications from Dr. Jordan.
For both of these, scouting fields helps greatly.

 

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

Clemson Extension – Peanuts