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1/2-Inch Green Delayed Dormant
Apple scab. For effective scab control, apply at least two half-sprays or one complete spray before the first infection period.
Insects. 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 and use a minimum of 100 gallons of water per acre. If mites were a problem the previous year, use at least 4 gallons per acre (or 2 gal oil/100 gal water--dilute) of dormant oil anytime between the green tip and 1/2-inch green periods. If the application is made later (up to tight cluster to open cluster), reduce the oil rate to 2 gallons per acre (or 1 gal/100 gal water). Again, use a minimum of 100 gallons of water per acre. Oil can cause plant injury if used improperly. (Also see Part III, Chemical Management.) Remember to use as high a volume as possible to achieve thorough coverage.
Rosy apple aphid. Oil alone will not prevent rosy aphid injury. Two close-interval alternate row middle sprays or one complete spray should be applied by 1/2-inch green leaf. When using Asana XL, Baythroid, chlorpyrifos, Danitol, Decis, Esteem, permethrin, Proaxis, Supracide, or Warrior in alternate row middle sprays, apply the first spray at green tip and the alternate row middle spray no later than 1/2-inch green tissue. 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 satisfactorily control European red mite.