Red oaks die rapidly after infection occurs. Leaf symptoms of oak wilt on Live Oaks are distinctive. The veins of the leaf turn yellow or brown while the rest of the leaf is green. Live oaks were once prized for their naturally curved limbs and trunk, used by shipbuilders in the 18th Century to fashion the ribs and planking of tall sailing ships, such as "Old Ironsides." Foliar symptoms in Red oaks are less distinct, and oak wilt is generally identified by the “flashing” of autumn colors during summer months and/or the presence of fungal mats. Examine freshly-fallen leaves to get a closer look. If the leaves have an oily sheen to them or appear to be taking on an unseasonal red, brown, or yellow tint around the veins or edges, there’s a chance that the tree is infected. Oak wilt, which is a much more serious tree disease, appears very similar to anthracnose. Oak Wilt is a disease caused by the fungus Bretiziella fagacearum that is specific to oaks (Quercus spp.). The fungus is spread through root grafts between neighboring trees and by insects. Today oak wilt is widespread in the southern half of Minnesota and continues to expand its range northward. To date, oak wilt covers about one-third of the area where Minnesota oaks grow. Live Oaks typically die within six months of infection with some individuals not dying for years. Sanitation. Refitting that ship in the 1980's included specialty pieces cut from live oaks in Texas that had been killed by the oak wilt … On live oak, the leaf symptoms are variable. Red Oaks are particularly susceptible to oak wilt. Members of the white oak group die very slowly after infection occurs and can carry the fungus in the vascular system without showing any symptoms. Oak species that are particularly susceptible to quick death from oak wilt include: Red Oak, Black Oak, Pin Oak, Burr Oak, Live Oak. This is an important disease of all oaks. DISTRIBUTION OF OAK WILT DISEASE. Other oak species, including White Oak, are affected to a lesser extent. Therefore, it is very important that you know for certain what you are dealing with. Uneducated or inexperienced advice can be very costly. Oak wilt usually shows itself among the growth in the canopy (roughly the upper third of the tree) first. Advanced training is required to accurately diagnose and properly treat the disease. Look for odd or discolored foliage. Oak trees, belonging to the genus Quercus, which includes over 600 different species of trees, have stood tall in America’s landscapes for centuries and can live over 200 years. We refer to this symptom as veinal necrosis (death of the vein) and it is considered diagnostic, Other symptoms include tip browning and leaf margin browning. Oak wilt is generally identified in Live oaks by patterns of tree mortality, and the presence of foliar symptoms (veinal necrosis). Symptoms show up on red oaks in early May as a bronzing of the leaves. 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