Bur oak blight (BOB) in Minnesota

By Jill Pokorny, United States Forest Service Update:  Here’s a May 2011 PDF fact sheet on bur oak blight (BOB), including identification and management considerations. Minnesota tree care companies, their arborists, and urban forestry professionals are advised to be on the lookout for a newly discovered disease of bur oaks. The first bonafide case of bur oak blight (BOB), confirmed […]

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Oak wilt risk status in Minnesota

Q. What is oak wilt? Oak wilt is a fungal disease that kills thousands of oak trees every year. Oak wilt spreads in two ways: Through root grafts between similar species, radiating outward from a central infected tree; and over land, carried by oak sap beetles carrying fungal spores from tree to tree. Q.  What are the “risk season” references? […]

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