Apple, Second Generation White Apple Leafhopper Timing Experiment, 1986

This test was conducted in a 6-year-old orchard with under-tree irrigation. A randomized complete block design with 4 single-tree replicates per treatment was used. Four applications of Lorsban 50WP at a rate of 1.5 lb (AI)/acre were made at weekly intervals with the first application date (1 Aug) determined by the first appearance of fourth instar WALH nymphs. Sprays were applied dilute to the point of drip with a handgun sprayer operated at 400-500 psi. Per acre rates were based on 400 gal/acre. WALH populations were determined by counting nymphs and cast skins on 20 randomly selected leafhopper-injured leaves from the terminal growth of each tree (80 leaves per treatment).