Follow the directions on the label. The symptoms are a slow decline of the tree. Mushroom fruiting structures on or near the root collar are prevalent in late summer and fall, especially during wet weather. Do not replant the site with a susceptible host. Infection of oak causes small brown or yellowing areas on the leaves.
High humidity increases the incidence of infection.
Chemical control is usually not warranted. The fungicides triadimefon or myclobutanil may be applied to oaks according to the directions on the label. Although mistletoe does obtain water and minerals from the tree, it does not depend totally on the tree for food. The green leaves of this plant contain chlorophyll and are capable of making their own food. Mistletoe produces small white berries, which are extremely toxic to humans.