Dogwood Spot Anthracnose

This disease is caused by a fungus that usually attacks the flower bracts first, and then the leaves, young shoots and fruit of flowering dogwood (Cornus florida). Look for small, reddish-purple leaf spots that are round or elongated. The spots are about the size of a pinhead. The centers are yellowish, with brown or black margins. As further infections occur, the spots become numerous and eventually merge to form larger leaf spots. The centers eventually drop out. This fungus survives from year to year on infected twigs, fruit and other tissues. Expect to see little disease if dry weather prevails before or during flowering time.

Control: In most cases this disease does not result in significant damage. Thin the canopy to increase air movement. Fungicides are available. Plant tolerant cultivars of flowering dogwood.