Abstract
Abstract Two identical tests were conducted in a 6-year-old apple orchard to evaluate efficacy of insecticides in controlling white apple leafhopper. Insecticides were applied as dilute sprays to the point of drip (approximately 400 gal per acre) using a handgun sprayer at 400-500 psi. Four single-tree replicates were used per treatment in a randomized complete block design. Pretreatment counts were made 15 May when first 4th stage nymphs were present in samples. Twenty-five leaves from each tree were examined and nymphs counted and recorded. Treatments were applied 15 May. Posttreatment counts using the same method as described above were made on 22 May.
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