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Soil Testing
and Plant Diagnostic Services
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Plant Diagnostic Clinic
573-882-3019
Tan, brown or purple spots on leaves. Remove and destroy fallen leaves. If serious, use thiophanate-methyl. Make first application at bud breakand the second 10 to 14 days later. Under wet conditions, apply a third spray 10 to 14 days later.
Small, water-soaked circular spots that eventually turn brown to purple. Twigs may become girdled, resulting in a blight. Prune and remove affected parts. Apply a copper fungicide several times at 10-day intervals, beginning when leaves emerge in the spring.
Whitish, powdery mold on leaves. If serious, apply fungicide spray at 7- to 10-day intervals. Use myclobutanil, triadimefon or wettable sulfur (95 percent) or lime sulfur. Start when mildew begins to appear on leaves.
Updated 3/31/05
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