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| Cherry leaf spot - Blumeriella jaapii (Rehm) Arx | ||||||||
| Cherry leaf spot is common on sweet and tart cherry, occasionally on plum. Small, red to purple spots appear on the upper surface of leaves; white to pink spore masses develop during wet weather on the undersides of the spots. The spots turn brown and often fall out, causing a shot-hole effect, predominantly on tart cherries. Infected leaves rapidly turn yellow and fall off. Whole trees may become defoliated by mid- to late summer. Sporulating, elliptical lesions may develop on the stems of fruits (in photo below). See the table on the next page for predictions of infection severity based on temperature and wetting period length. Are conditions right for cherry leaf spot? Forecast models for cherry leaf spot are available at Enviro-weather. Select a weather station from the map that is closest to your location. Then click on “fruit” for a list of weather resources and models for fruit production. |
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| Approximate number of hours of wetting
period required for conidial infection by the cherry leaf spot fungus at various air temperatures. |
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Additional information
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| Images on this page provided by Alan L. Jones. This information was developed from A Pocket Guide for IPM Scouting in Stone Fruits by David Epstein, Larry J. Gut, Alan L. Jones and Kimberly Maxson-Stein. Purchase this in a pocket-sized guide for reference in the orchard from MSU Extension (publication E-2840). |
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03/03/08