Abstract Imidan and Guthion were evaluated for CM control when used in a seasonal spray program. 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 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 gallons per acre. The first application coincided with beginning of CM egg hatch as predicted by the CM degree day (°D) model at 250°D after first capture of males in pheromone traps [BIOFIX], 29 May. The second application was made 21 days following the first. The third application (first against the second generation) was made at 1250°D following BIOFIX, 22 Jul; and the last application was made 21 days following the third. 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 in Jun, Jul and Aug. 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. Aphids were evaluated by examining 10 shoots in two replicates (trees) per treatment on 5 Jul, after the first two sprays had been applied in all treatments, and recording the number infested by aphids as well as the number of aphids on the most infested leaf.