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Preharvest
Diseases. Fruit rots, powdery mildew, leaf spot.
Insects. Cherry fruit flies.
Powdery mildew. For powdery mildew control after the first cover, Benlate, Topsin-M, or fixed copper plus lime may be substituted for captan. Use the rates given in the postharvest spray. Copper may cause severe injury if aphids are present.
Pesticide Recommendations for Tart Cherries, Preharvest
Sprays before harvest. Refer to Table 4-16 when selecting sprays during the last month before harvest.
Cherry leaf spot. See cherry leaf spot under Postharvest Disorders of Sweet Cherry.
Peachtree borer and lesser peachtree borer (LPTB). For LPTB, apply as a coarse spray to trunk and lower limbs in up to two sprays: June 10-20 and August 10-25. Do not spray fruit; there is a 14-day preharvest interval for Asana XL, a 3-day preharvest interval for permethrin, and a 21-day preharvest interval for endosulfan, Lorsban 4E, and Lorsban 75WG. For peachtree borer, apply as a coarse spray to the trunk only and make 2 applications, the first around July 15 and the second around August 10. Use Asana XL (4.0 fl oz) or Lorsban 4E (1.5-3.0 qts) or Lorsban 75WG (2-3 lbs) or permethrin 3.2AG (1.6 fl oz) or Thionex 50W (1 lb) per 100 gallons of water. If using only one application, apply between July 20 and August 1.