Affected leaves appear to be sun scorched. It usually starts at the top of the tree and progresses downward. Oak tree leaves may be deeply pinnatifid-like seen in Canada. The shape of the leaf may be ovate, obovate and sometimes, elliptic. The white oak group is less vulnerable; those oaks with round-tipped leaves. Try These 4 Tips if Your New Tree’s Leaves Are Turning Brown or Wilting Posted on August 12, 2017 by Econo Tree Service If you have recently planted a tree, you know that it will likely go through some sort of “ugly” period – a time when the tree doesn’t look its best because it has just gone through something truly traumatic. The bug carries spores from an infected tree to a healthy tree and, in some cases, causes death. The oak tree on the right has brown leaves due to oak wilt. Foliar symptoms of oak wilt on red oaks are less distinct. Rarely a serious problem. The leaves may appear to be water-soaked and wilting and may begin to curl around the mid-rib. The number of lobes may be from 5 up to 20 in a leaf. The oak wilt fungus invades the water-conducting tubes of oak trees, eventually causing leaves to wilt and die. The characteristic features in an oak leaf are its lobes and sinuses (space between the lobes). All species of Oaks are susceptible, with some species being somewhat tolerant. Oak wilt often affects closely spaced groups of trees because it is spread by root grafts. Different trees … Oak wilt is caused by bugs that feed on the sap of a newly trimmed tree. The wilting process starts from the tips of the leaves. Oak wilt is fatal for all the species in the red oak group; those oaks with pointy-tipped leaves. One is via the root system. Oak wilt affects both red and white oaks but is more common in red oaks. Brown, dead areas appear along leaf veins. All oaks are susceptible to the disease, but oaks in the red oak group, such a red, pin and shingle oaks are more susceptible than oaks in the white oak group, such as white, bur and swamp oaks. This deadly disease first appears as wilting of the leaves in the late spring and early summer. Leaves of infected trees begin to lose their green color, dulling and then browning or yellowing from the outer edges inward. Wilting usually starts at the top or outer portions of the tree crown and quickly progresses downward. Mature leaves develop dark green water soaking symptoms or turn pale green or bronze, starting at the leaf margins and progressing inward. The fungus enters the tree and stops the flow of water as well as elements by plugging the vessels in the vascular system. Symptoms appear in the spring and early summer beginning near the top of the tree with leaves developing an abrupt margin between green and brown dying leaf tissue. Eventually, the leaves wilt and fall off the tree. Look-alikes: Oak wilt, environmental scorch, jumping oak gall Anthracnose Affects both oak groups. How it Spreads There are 2 different ways oak wilt can spread. The fungus needs cool wet weather. The oak tree leaf is broad, thin and flat and is called a broadleaf. Following infection, the fungus is quickly transported through the water-conducting system of red oaks and leads to rapid wilting. Oak species most … Leaf damage is the earliest indication of oak wilt. Wider spread is by sap beetle feeding. Lower branch leaves are most affected. Trees in the red oak group have fan-shaped leaves with sharply pointed tips, those in the white oak group have fan-shaped leaves with rounded or blunt tips, and trees in the live oak group have oval leaves with pointed to rounded tips (figure 2). Oak Wilt and Its Symptoms Oak Wilt is a vascular wilt disease of Oak trees caused by the fungus, Ceratocystis fagacearum. Dead branches often develop dark streaks below the bark. 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