Refitting that ship in the 1980's included specialty pieces cut from live oaks in Texas that had been killed by the oak wilt … 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. Leaf symptoms of oak wilt on Live Oaks are distinctive. 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. Other oak species, including White Oak, are affected to a lesser extent. Oak species that are particularly susceptible to quick death from oak wilt include: Red Oak, Black Oak, Pin Oak, Burr Oak, Live Oak. These hardwoods offer us plenty of shade and are also favored for their grand appearance and the beautiful backdrop of color they provide during the fall months. Oak Wilt is a disease caused by the fungus Bretiziella fagacearum that is specific to oaks (Quercus spp.). Advanced training is required to accurately diagnose and properly treat the disease. Today oak wilt is widespread in the southern half of Minnesota and continues to expand its range northward. One thing you can do to help prevent anthracnose from spreading or returning to your tree is to keep the fallen leaves raked up all the time. Oak Wilt Transmission. 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 Wilt most frequently spreads from tree-to-tree by root-to-root contact. Sanitation. Oak wilt was first discovered in Minnesota around 1950. Examine freshly-fallen leaves to get a closer look. Oak wilt is generally identified in Live oaks by patterns of tree mortality, and the presence of foliar symptoms (veinal necrosis). To date, oak wilt covers about one-third of the area where Minnesota oaks grow. DISTRIBUTION OF OAK WILT DISEASE. Live Oaks typically die within six months of infection with some individuals not dying for years. Oak wilt, which is a much more serious tree disease, appears very similar to anthracnose. The fungus is spread through root grafts between neighboring trees and by insects. Oak wilt usually shows itself among the growth in the canopy (roughly the upper third of the tree) first. The veins of the leaf turn yellow or brown while the rest of the leaf is green. Symptoms show up on red oaks in early May as a bronzing of the leaves. Oak wilt is a major disease problem on live oaks, Shumard oaks, Spanish oaks, water oaks, black jack oaks and other members of the red oak family. Uneducated or inexperienced advice can be very costly. This is an important disease of all oaks. 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. Red Oaks are particularly susceptible to oak wilt. 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