Answer: The leaf symptoms are probably due to the drought, especially if new growth is visible now. On the other hand, dogwood trees are susceptible to a disease called Anthracnose. The symptoms include browning at the edges of the leaves and irregular, wedge-shaped brown blotches on leaves. The fungus lives on dead twigs and leaves and will reinfect the tree if not raked up and disposed of as they fall. Inspect your trees for sunken tan to brown spots on the twigs. The best treatment for this disease is to prune out and destroy affected twigs, rake and destroy fallen leaves all season, and try not to let the tree canopy get wet from sprinklers.
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