Dogwood Anthracnose is a common disease of most flowering Dogwoods. It is a fungus that thrives in cool and wet conditions. It is more active in early spring and fall, but it can occur at any time during the growing season. Trees that are stressed by drought and winter injury are usually more susceptible to this fungus. Most of the time, trees can recover from moderate injury, however, consecutive years of heavy infections can weaken trees to the point of no recovery.
Bordeaux Mix, which is made of Hydrated Lime and Copper Sulphate, helps to minimize the effects of the infection and reduce the spread of the fungus. Depending on weather, three or more applications may be necessary to protect the foliage from this pathogen.