Anthracnose is a fungal disease that tends to attack plants in the spring when the weather is cool and wet, primarily on leaves and twigs. The fungi overwinter in dead twigs and fallen leaves. Cool, rainy weather creates perfect conditions for the spores to spread. Dry and hot weather stop the progression of the disease that may begin again once the weather conditions become optimal. The problem can be cyclic but is rarely fatal.  er to distinguish between anthracnose and other leaf spot diseases, you should carefully examine the undersides of leaves for a number of small tan to brown dots, about the size of a pin head. If you are unsure about diagnosing anthracnose, consult your Extension Service where you can bring in a sample for positive ID. Please call our GARDEN LINE<personal data hidden> for directions on how to gather the sample and where to bring it.

Anthracnose control begins with practicing good sanitation. Picking up and disposing of all diseased plant parts, including twigs and leaves, from the ground or from around the plant is important. This keeps the fungus from overwintering near the plant.

Proper pruning techniques to rid trees and plants of old and dead wood also helps with prevention of anthracnose fungus.

Keeping plants healthy by providing proper light, water and fertilizer will strengthen the plant’s ability to ward off a fungus attack. Stressed trees and plants have a difficult time recovering from anthracnose fungus.

Chemical treatment is rarely used except when the disease involves newly transplanted plants or continual defoliation.