Crabapple: Powdery mildew - Crabapple Tree Powdery Mildew

Powdery mildew of crabapple is typically seen on the foliage, but may also occur on twigs, blossoms, and fruit. Characteristic patches of white, powdery fungus develop on the leaves and terminal shoots. Infected young leaves often become deformed and curled. Infected shoot tips may be deformed or die back. Small black fungal fruiting bodies may develop in the white areas. Symptoms of fruit infection include white powdery growth and russeting (development of brown or rust-colored, corky patches on the fruit). The fungus may overwinter in infected buds.
Management Options

Hortsense web site created by Carrie Foss, Pesticide Education, and Art Antonelli, Extension Entomology, WSU Puyallup
Pesticide information review provided by Catherine Daniels, Washington State Pest Management Resource Service
Database programs developed for Hortsense by Kathleen Duncan, Computer Resources, WSU Pullman
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