Liquid Treatments for Control of Southern Corn Rootworm Injury in Peanut, 1991

Abstract

Abstract Lorsban 4 E, applied at different times and rates, was evaluated for control of SCR pod injury in 'NC 7' Virginia-type peanut in Suffolk, VA. Peanuts were planted on 13 May using a 36-inch row spacing. Lorsban 4 E was applied at planting time either broadcast preplant incorporated (broadcast, ppi) or banded preplant incorporated (band, ppi), or banded at early flowering time (14 Jun). Planting time broadcast treatments were applied just before planting, with a CO2 pressurized backpack sprayer calibrated to deliver 20 gal/acre at 17 psi through 8003VS flat fan nozzles spaced 18 inches apart on the spray boom. Planting time banded applications were made in a 14-inch band with the same spray equipment, but calibrated to deliver 17 gal/acre at 22 psi through one 8004E nozzle per row. Both were soil incorporated 3 to 4 inches deep with a land conditioner. Early flowering treatments were applied in 14-inch bands with the same spray equipment, but calibrated to deliver 15 gal/acre at 22 psi through 2, 8002E nozzles per row, 1 on each side of the row, then lightly soil incorporated with cultivator sweeps in row middles. Lorsban 15 C was applied as a 14-inch band at early flowering time as a treatment standard. A randomized complete block experimental design was used with 4 replicates; plots were 4 rows by 40 ft. Pod injury was determined on 5 Sep from 100 randomly selected pods per plot, taken from 5 plants per plot (20 pods/plant). Percent injury was determined for mature, immature, and total pods sampled. Yield was based on digging, combining (8 Oct), drying, and weighing peanuts from the 2 center rows of each plot. Data were analyzed using ANOVA and LSD statistical procedures.