Oil is effective in San Jose scale and mite control. Adding an insecticide will strengthen the program against aphids, mites, leafrollers, and scales. In all orchards where oil is not used, check for mites on a regular schedule. For mite control, make oil applications between green tip and tight cluster to open cluster. The mite problem has resulted mainly from the failure of the mid-season miticides.
Oil can cause plant injury if used improperly.
Remember to use as high a volume as possible to achieve thorough coverage. Rosy apple aphid. Oil alone will not prevent rosy aphid injury. Only a gallon or less of oil per acre is needed when using these products for aphid control. However, this low rate of oil will not control European red mite.