Control moderate to heavy populations of San Jose scale by applying an organophosphate insecticide with the oil spray. If control of San Jose scale is a problem in the orchard, use a high-volume dilute application and apply it by ground. The following materials are listed in order of usefulness in an IPM program, taking into account efficacy and impact on natural enemies. Apply before blossoms open or injury may occur. Do not graze treated areas or feed cover crops grown in treated areas to livestock.
Organophosphate insecticides used during delayed dormancy are very toxic to honey bees.
Remove bees from orchard if cover crops or weeds are in bloom. Oil sprays may injure trees that are water stressed. It is advisable to postpone an oil application to water-stressed trees until winter rains have replenished soil water and the tree bark is noticeably moist. Resistance to diazinon has been a problem in some populations of San Jose scale. Apply before blossoms open or injury may occur.