SPIREA DISEASES
SPIREA DISEASES
Fire blight causes the leaves to appear scorched. The twigs tips die back and dead leaves hang on blighted branches. There is no satisfactory chemical control. Prune out infected branches and avoid high nitrogen fertilizer.
A leaf spot may infect the leaves. Use basic copper sulfate.
Powdery mildew forms a white coating on the leaves. Use benomyl or sulfur.