Oak

From Bugwoodwiki

USDA Forest Service. 1979. A guide to common insects and diseases of forest trees in the northeastern United States. Northeast. Area State Priv. For., For. Insect and Disease Management., Broomall, PA. p. 123, illus.

Oak anthracnose, caused by Gnomonia quercina, affects white oak and other oaks in the white oak group. Trees growing at the edge of a stand or in the open are affected more severely than those in forest stands.

Anthracnose begins as irregular areas of dead tissue along the midribs and veins of infected leaves. Severely infected leaves become curled and twisted, and in wet year premature leaf fall may occur. Emerging oak leaves that are attacked but not killed may be distorted. Leaves on the lower branches generally are more severely affected than those on the upper branches. The pathogen may spread into the twigs and form cankers that can cause some twig dieback.