Potato Leafhopper Control in Ohio, 1993

Tests were conducted at the OARDC Western Branch Field Station near South Charleston to evaluate the efficacy of 7 insecticide treatments for control of PLH on a 3rd cutting of 4 year old alfalfa stand. Plots were 30 × 50 ft with 4 replications per treatment in a RCBD. Treatments were applied on 26 Jul with a custom built sprayer having a boom length of 15 ft and flat spray tip nozzles (TeeJet 8003VS) mounted at 15 inch intervals. The system was calibrated to deliver 37 gpa at 30 psi at a tractor speed of 3 mph. Treatments were applied when avg alfalfa stem length was 11.5 inches (29.3 cm). PLH adult abundance was estimated by taking 20 pendulum sweeps in each plot prior to treatment and 2, 7, 14 and 21 DAT. Counts of PLH nymphs were omitted since presence of PLH nymphs was minimal. Alfalfa stem length was recorded prior to treatment and during final sampling taken at 21 DAT.