Blight causes brown or black spots which extend inward
Space plants farther apart in subsequent plantings.
Remove infected plants.
Canker and dieback cause the shoot tip to become dark
Several fungi cause leaf spots on periwinkle.
Root rots cause ...
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Space plants farther apart in subsequent plantings.
Remove infected plants.
Canker and dieback cause the shoot tip to become dark
Several fungi cause leaf spots on periwinkle.
Root rots cause ...
More Information