Apple, Pre-Bloom Control of Pandemis Leafroller, 1985

Ten-year-old apple trees were sprayed with insecticides to evaluate their efficacy in controlling overwintering larvae of apple pandemis. Insecticides were applied as a dilute spray to the point of drip (approximately 400 gal per acre) using a handgun sprayer at 400-500 psi. All materials were combined with 1 gal of oil/A. The test experimental design was a randomized complete block with 5 single-tree replicates per treatment. Pre-treatment counts were made on Apr 10. Ten fruit buds from each tree were removed and returned to the laboratory for examination under a dissecting microscope. Numbers of larvae found were recorded. Treatments were applied on 10 Apr at half-inch green stage of flower bud development. Post-treatment counts were made on 18 Apr. Each tree was examined and the number of leafroller feeding sites and live larvae recorded.