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In the Willamette Valley, Dogwood trees are susceptible to the disease called anthracnose. This disease affects the leaves by causing lesion which can lead to early defoliation of the tree. The fungus attaches itself to the woody stems of the tree and are scattered by rainfall.
The treatment program consists of four applications of systemic or contact fungicide during the spring as the new leaves are developing. We usually make the first application in early April and the subsequent treatments are made on two week intervals.