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What is Anthracnose?
Anthracnose is a term applied Jo a group of foliar diseases that affect many hardwood tree species throughout the United States. It is most prevalent and destructive in early spring when cod, moist weather conditions favor disease development. On highly susceptible species such as sycamores, oaks (especially white oaks), maples, ash and walnut, anthracnose may result in leaf and shoot blight, defoliation and even twig dieback. Repeat infections can cause gradual decline in tree health.
Foliar symptoms vary considerably. On sycamore, white oaks and maple, large irregular brown to purplish lesions (dead areas) develop usually along leaf veins. On ash, black oaks, dogwood and walnut, discrete curricular or angular lesions occur on leaves. Blight and defoliation usually occur in early spring when leaves are small and succulent. Crowns of severely diseased trees appear thin and scrubby.
Removing fallen leaves and twigs to reduce overwintering fungi that cause anthracnose, and periodic pruning to allow optimum light and air penetration of the crown, will inhibit disease development High nitrogen fertilization will also suppress disease seventy, and properly timed fungicide applications will help control anthracnose. Once infection occurs, however, chemical sprays are ineffective in preventing further disease development.
For more information or to schedule an appointment for a complimentary consultation with me, call 877-BARTLETT today, or e-mail me at jwood@bartlett.com.
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