Apple, Timed Insecticide Treatments for Control of the Leafroller Complex, 1984

Treatments were applied to mature York trees in a comparative test on 21 Jun, 29 Jun, 16 Aug and 28 Aug. Single tree treatments were used in a randomized block design and replicated 4 times. Trees were sprayed to runoff using a Bean 35 gal/min hydraulic sprayer operating at 400 psi. Because of high mite populations, Vendex 4F 8 fl oz/ 100 gal was added to all treatments on 21 Jun and 29 Jun. A preliminary evaluation of leafroller injury to fruit was done on 15 Aug by checking 50 apples/ replicate. Fruit were examined on trees and total injuries by first generation leafrollers were recorded. Fruit samples (100/rep) were harvested and examined on 2 Oct for leafroller injury.