Blight starts as reddish brown spots with graying centers. Dark brown cankers form on the stems and flowers are spotted or completely blighted. The disease is also called alternaria leaf spot.
Powdery mildew is found on zinnia, particularly late in the season. The disease causes a white to grayish powdery growth on the leaves. This disease will be controlled with applications of chlorothalonil or benomyl.
Bacterial leaf spot causes reddish brown, angular spots on the leaves and can cause plants to die out by mid-August. No chemical control is listed for bacterial leaf spot.
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|Powdery mildew on zinnia - 29K|