Abstract
Abstract Effects of standard compounds and practices used in commercial orchards on first generation WALH were examined. This test was conducted in a commercial orchard containing 12-year-old trees, with under-tree irrigation. Treatments consisted of unreplicated plots 1.0 acre in size. A first set of treatments was applied on 19 May, when fourth instar WALH nymphs were first detected. A second set of treatments, consisting of Sevin 50WP at rates recommended for fruit thinning, was applied on 25 May. All materials were applied with a Parker airblast sprayer delivering 400 gal/acre at a ground speed of 2 mph. WALH populations were estimated by counting nymphs on 10 randomly selected leafhopper-injured leaves on 10 randomly selected trees from the central region of each plot (100 leaves per treatment).
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