Potato Leafhopper Control In Alfalfa, 1995

Six insecticide treatments were applied to 8.6 inch tall alfalfa in the early bloom stage near Concord, NE, on 20 Jul. Plots were 20 X 20 ft arranged in a RCB design with 4 replications. Treatments were applied with a 4 nozzle CO2 backpack sprayer equipped with T-jet 11002 nozzles delivering 18.0 gal/acre at 25 psi. Air temperature at the time of application was 80° F with a north wind at 5-10 mph. Evaluation was by counting the number of leafhoppers (adults and nymphs) per 10 sweeps of a 15 inch diam net on 3, 5, 12, 15, and 21 DAT. Pretreatment field counts averaged 38 leafhoppers per 10 sweeps.