Anthracnose, bur oak blight, or oak wilt all can cause issues with oaks. March 2015 webinar: oak wilt versus bur oak blight March 2, 2015 6 Comments Tuesday, March 24th from noon to 1:00pm *Note change in date. Above-average rainfall for Its extent nearly covers Minnesota. However, it is suspected that the fungus that causes the disease has probably been here much longer. Theories on why bur oak blight has increased A common leafspot fungus, var. Oak wilt is a serious disease that can infect many oak species. Narrative: Bur oak blight has been recognized in Iowa for only the last 13 years. Bur oak blight, caused by Tubakia iowensis (T.C. To be certain that we did indeed have bur oak blight, we had infected leaves analyzed at the UW-Madison Plant Disease Diagnostic Laboratory. Oak wilt is a disease caused by a fungus. Red oaks are very susceptible to the oak wilt fungus and can die within 4-6 weeks. Wisconsin's native oak pests include Two Lined Chestnut Borer, Oak Wilt, and Bur Oak Blight. Contact If you have questions about your Bur Oak or one somewhere else, please contact the City of New Ulm Engineering office at 507-359-8245. Generally, oaks in the red or black oak group (pointed leaf lobes) develop discolored and wilted leaves at the top of the tree or at the tips of the side branches in late spring. Oak wilt diagnoses may be confirmed by isolating the fungus from diseased tissues in the laboratory. A native fungal pathogen called Tubakia iowensis causes the disease. Bur Oak Blight should not be confused with Oak Wilt which is a completely different disease and nonexistent in New Ulm at this time. Bur oak blight. Red Oaks are particularly susceptible to oak wilt. Oak wilt is old news but still newsworthy. + How Does Oak Wilt Spread? This is a fungal leaf disease. MacBride (1899) describes “trees … another 200 years if not eliminated by Bur Oak Blight, Oak Wilt, or high water levels which will displace soil oxygen (Schwartz 2014). Like oak wilt, leaves have dead, brown areas, and many prematurely fall. Bur oak blight is a fungal leaf disease found throughout Minnesota. In Wisconsin, however, our Bur Oaks are of the oliviformis variety, which has smaller acorns than the species. Bur Oak Blight Repeated, and progressive disease development will weaken the tree and allow for secondary problems such as Two Lined Chestnut Borer, which may result in tree death. The white oak group is more resistant to the oak wilt fungus bur Bur oak does get oak wilt as well as bur oak blight, but both does cause white fungal growth like the picture shows. By planting native tree species tolerant of Oak Wilt and diversifying the species we plant, we not only suppress various pathogens and insects, but we encourage a diversity of wildlife and habitat. The fungus enters the tree and stops the flow of water as well as elements by plugging the vessels in the vascular system. Oak wilt can attack all species of oak, but the red oak group is most susceptible. Many of you have heard about the dangers of oak wilt, which has killed hundreds of thousands of oaks over the past 50 years. Oak wilt is an infectious disease caused by the fungus Bretziella fagacearum, which invades and disables the water-conducting system (xylem) in oaks. It's beginning to look like bur oak blight, or BOB for short, is a long-time resident of Iowa, and he's here to stay. Bur Oak Blight and Look-alike Diseases The U of I Plant Clinic has received many samples and questions regarding diseased bur oak trees. The most important insect cause of oak mortality is the... Tubakia iowensis, Bur Oak Blight is a fungal disease that is relatively new to our area that we should be aware of. 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