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Petal Fall
Diseases. Brown rot, leaf spot. If a fungicide was not used during bloom, it is important to make the first application at petal fall.
Insects. Plum curculio, leafrollers, aphids. Black cherry aphid. If the aphid is present, add Actara or Provado.
American plum borer. American plum borer has been increasing in tart cherry orchards in Pennsylvania. Control of this pest can be achieved at petal fall by applying a dilute application of Thionex 50W at 1 pound per 100 gallons or chlorpyrifos 4EC at 1.5-3.0 quarts per 100 gallons or Lorsban 75WG at 2 to 3 pounds per 100 gallons. Direct spray to the entire trunk area up to the lower scaffold limbs and to all areas cracked and damaged by shaker clamps or other means. Do not apply chlorpyrifos 4E or Lorsban 75WG to sweet cherries, as it is highly phytotoxic to the foliage.