A few cases have been reported at lower elevations where dogwoods are grown in very cool, moist and shady locations. It is most severe only in areas of the state above 2,000 feet. Apply all chemicals according to directions on the label.ĭogwood anthracnose is a relatively new disease. Fungicides for spot anthracnose will also control dogwood anthracnose (canker anthracnose). Fungicides available for use include chlorothalonil, mancozeb, maneb, propiconazole, thiophanate-methyl or copper fungicides. If spotting becomes severe, fungicides can be used in the spring starting at bud break and continuing until leaves are fully expanded. The worst spot anthracnose has been reported on Cornus florida rainbow and Cherokee daybreak. florida) Cherokee brave, Cherokee chief, Welch’s Bay beauty, Cherokee princess and springtime. Varities generally resistant to powdery mildew are: Resistant species and cultivars are available and should be considered for new plantings. When powdery mildew persists and sprays are repeated, it is recommended to alternate fungicides to decrease the chance of the fungi developing a resistance. Product labels will provide information on how often to spray. Some control can be obtained with thiophanate methyl. Effective fungicides for dogwood powdery mildew control include myclobutanil and propiconazole. If the disease is severe enough to warrant the use of fungicides, be sure the spray equipment can provide good coverage. If you can, try to improve air circulation and sunlight by removing overhanging branches. Start by raking up and getting rid of all fallen leaves. But when they are present in the spring, treat the disease with a fungicide.īefore going straight to chemical warfare, try something to keep it from returning later. Usually powdery mildews come on late in the year and generally do not pose a big threat to the plant’s health.
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