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Peanuts ‘Va. 61R‘ planted May 21, 1975 received band applications of granular insecticides and foliar sprays at delayed pegging on July 22, 1975. Plots were 4 rows (36 inch spacing) by 20 ft length with 5 ft alleys between 4 replications in randomized blocks. Soil was classified as a Bertie Sandy Loam. The test area had been in continuous corn production for 10 or more years. Granular insecticides were applied as 14-inch bands with precalibrated, tractor-mounted, Ezee Flow, granular applicators driven by electric motors. Sprays were applied as 12-inch bands over the foliage with a CO2 pressure-regulated, knapsack sprayer calibrated to deliver 18 gal/acre at 50 psi. Treatments were not incorporated into the soil by cultivation due to excessive vine growth at the time of application. Insect damage evaluations were made September 15 to 19, 1975 by hand-digging 4 randomly selected plants from the 2 center rows of each plot. Mature and immature peanuts were pulled from the composite sample, washed and evaluated for rootworm feeding injury. Pods were separated into categories of mature and immature as an aid in evaluating residual efficacy of the chemicals. Weather patterns were unusually dry during August and likely affected efficacy of some insecticides. Rootworm injury on control plots was considered sufficient for good chemical evaluation.

Peanut Injury and Southern Corn Rootworm Chemical Control. Suffolk, 1975