Apple, Codling Moth Control with Sevin, 1991

Sevin at different treatment schedules were compared to the standard rate and timing of Guthion for control of CM. The test orchard was located at the Tree Fruit Research and Extension Center, Wenatchee. Test trees were 17-year-old non-spur ‘Red Delicious’ and ‘Golden Delicious’. The orchard was irrigated by under-tree sprinklers on a 14-day schedule. The test design consisted of four single-tree replicates in a randomized complete block design. Treatments were applied with a handgun sprayer at 300 psi to the point of drip, simulating a dilute spray of approximately 400 gal/acre. In all cases the first treatment was applied at the beginning of CM egg hatch, 28 May, 250 degree days following first capture of moths in a pheromone trap. After the first CM generation (16 Jul), 100 fruit from each replicate were examined and the number damaged by CM recorded. At harvest (29 Aug), 200 fruit were picked from each replicate and examined for damage by CM and PLR. CM damage was rated as a “sting” (an unsuccessful entry in the fruit denoted by a scar but no penetration) or a deep entry. Mites were sampled from Jun through 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.