Trimming to prevent oak wilt
Majestic mighty oaks are susceptible to tiny fungus-spreading beetles. Oak sap beetles move fungal spores that spread oak wilt from tree to tree. Preventive pruning is the best defense.
Trim oak trees from November through February when oak wilt disease is dormant. Risk of infection is lower during cold weather. If oak trees are trimmed from April through October, a sealant of shellac or water-based paint should be applied to all cut branches and other wounds to prevent oak wilt infection. Disinfect tools if moving between multiple trees.
Fortunately, oak trees require little trimming. Low branches, storm damage, and growth into rooflines, gutters and other unwanted areas can necessitate trimming.
For information, visit blm.mn/trimoak or call 952-563-8760.