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Sooty Blotch and Fly Speck (Apples and Pears)

Sooty Blotch and Fly Speck (Apples and Pears)


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


Plant disease-resistant varieties. Spray with a copper soap fungicide when disease first appears, and repeat at 7- to 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 a copper soap fungicide, applied in early spring, may help eradicate overwintering infections that became established on twigs the previous season. We recommend Soap-Shield® Flowable Liquid Copper Fungicide*.

*NOTE: If used frequently, Soap-Shield may cause leaf burn. If leaf burn develops, discontinue the use of Soap-Shield spray.

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