Apple, Seasonal Control of Codling Moth, 1992

Lorsban alone or in combination with a wetting agent, Kinetic, was evaluated for control of CM. The test was conducted in an orchard located at the Tree Fruit Research and Extension Center Columbia View plots near Wenatchee. Test trees were 10- to 12-year-old Golden Delicious on a dwarfing root. The orchard was irrigated by under-tree sprinklers on a 14-day schedule. The test consisted of four single tree replicates in randomized completed blocks. Treatments were applied with a handgun sprayer at 400 psi to the point of drip, simulating a dilute spray of approximately 400 gal/acre. Applications were timed to coincide with hatch of CM eggs as predicted by a degree day model. The first application was made on 12 May at 250 degree days following first moth capture in pheromone traps. The second application was made 21 days following the first. The third application was made on 1 Jul, 1250 degree days following capture of the first moth of the year, and the fourth application was made on 21 Jul. Weather during application periods was generally good with little wind and no precipitation. CM pressure in the orchard was high. Mites were sampled in Jun and Jul. Twenty-five leaves were collected from each tree. In the laboratory leaves were processed through a mite brushing machine and each mite species was counted with aid of a dissecting microscope.