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Sooty Blotch and Fly Speck (Apples & Pears)

Description: These two diseases often occur together because they have similar, and numerous, wild hosts.

Sooty blotch and fly speck are most likely to develop when temperatures are between 65 and 80F and when humidity is high. This combination occurs most frequently when nighttime temperatures remain above 65 to 70F during summer, or during extended warm rainy periods. Sooty blotch and fly speck infections which are not yet visible at harvest can develop during storage.

Solution: Spray Soap-Shield Fungicidal Soap when disease first appears, and repeat at 7-10 day intervals for as long as needed. For optimum control, begin spraying 2 weeks before disease normally appears, or when temperature and humidity conditions favor disease establishment. If summer diseases such as sooty blotch and fly speck have been a serious problem in past years, dormant sprays of Soap-Shield or Liquid Copper, applied in early spring, may help eradicate over-wintering infections that became established on twigs the previous season.

NOTE: If used frequently, Soap-Shield may cause leaf burn. If leaf burn develops, discontinue Soap-Shield sprays, and use Micronized Sulfur instead.


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