Photo by Joseph O’Brien, USDA Forest Service. It is most common along … Monday, February 11, 2019 8:00 AM 08:00 Wednesday, February 13, 2019 5:00 PM 17:00; Lansing Center 100 W Michigan Ave. Lansing, MI 100 W Michigan Ave. Lansing, MI Fortunately, this valuable resource can be protected by utilizing effective management techniques. Once the wood is dry and the bark is loose or fallen off (about one year), it is no longer a source of infection. For more information on a wide variety of Smart Gardening topics, visit www.migarden.msu.edu or call MSU’s Lawn and Garden hotline at 1-888-678-3464. Since there are other pest, pathogen and environmental problems that may cause symptoms similar to oak wilt, a branch sample must be sent to a diagnostics laboratory for an accurate diagnosis. It first appears as a gray clump on injured bark called a "pressure pad." Department of Natural Resources Forest Health Division: DNR-FRD-Forest-Health@michigan.gov or by phone at 517-284-5895. File photo provided by the Michigan Department of Natural Resources. August 9, 2019 The DNR treated 26 epicenters in 2019. Bur oaks die between one and seven years after infection, while white oak… One by one, majestic red oak trees are being ravaged by oak wilt, a fungal disease that destroys a tree's vascular system. Oak wilt is a devastating exotic disease, killing some trees rapidly in a single season. Thus, those who intend to prune their oak trees are encouraged to do so in the winter instead of the high-risk period from April 15-July 15 when the beetles are most active. Trenching equipment is used to cut a 5-foot deep line into the earth separating roots of dead and infected oaks from the unaffected oaks in the area. Firewood is also a known contributor to the spread of oak wilt disease, and oak firewood should not be moved to prevent the chance of healthy oak forests being impacted by firewood that is host to oak wilt disease. The image of Michigan without oak trees is not a good one! Oak wilt is a fungal disease that kills thousands of oak trees each year in forests, woodlots and urban areas. Share This Story, Choose Your Platform! National Forest Damage Agent Range Maps. Oak wilt is caused by a fungus. BRIGHTON, Mich. – Oak wilt is a fungus and a quick tree killer which shows up between April 15 and July 15. Prevent overland transmission of oak wilt by strictly following guidelines for safest pruning times and care of trees damaged during spring and summer. White oaks, those with rounded lobes and no bristles, or with large regular teeth, will slowly decline and likely die. Protecting the health of Michigan's forests is a challenging task that requires collaboration. If you find a mycelial mat on a dead oak—normally visible beneath a bark crack—that is sufficient for positive diagnosis. Search This Site. Share or view as webpage | Update preferences - Showcasing the DNR - Battling oak wilt disease. I am worried about oak wilt in a large oak tree in our backyard in Rochester Hills. The fungus grows on the outer sapwood of oak trees restricting the flow of water and nutrients through the tree. The bug carries spores from an infected tree to a healthy tree and, in some cases, causes death. The worst time is mid-April to mid-July when beetles are most likely present. Trees that were killed by oak wilt. MSU is an affirmative-action, equal-opportunity employer. Residents warned to watch out for oak wilt. How do I spot it? It causes untimely death of oak trees and spreads extremely quickly both below and above ground. The fungus grows on the outer sapwood of oak trees restricting the flow of water and nutrients through the affected but are more resistant.tree. Although the spring season is usually the ideal time for many people to complete yard work, oak trees benefit greatly from being pruned during the winter months instead. 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