Evaluation of Foliar Treatments for Potato Leafhopper on Alfalfa, 1997

A study to evaluate the efficacy of 9 foliar insecticide treatments to control PLH was conducted on the second cutting of alfalfa at the OARDC Western Branch Station near South Charleston, OH. Plots were 20 X 50 ft with four replications in a RCBD. Treatments were applied 25 Jul with a custom-built sprayer having a boom length of 10 ft and TeeJet 8002 nozzles spaced at 15-inch intervals. The system was calibrated to deliver 25 gpa at 35 psi at a tractor speed of 3 mph. Abundance of PLH adults and nymphs were estimated prior to treatment and at 7, 14, and 20 DAT by taking 10 pendulum sweeps per plot. Alfalfa stand heights were recorded prior to treatment and at 20 DAT to determine stand growth per treatment