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Don't prune oak trees this spring

April through June is the high risk period for oak wilt disease. And that means you should avoid pruning oak trees until at least this July, say forestry specialists with the University of Minnesota Extension Service and USDA Forest Service.

If oak trees are accidentally wounded or pruning is unavoidable, cover the tree wounds immediately-within minutes. Use water-based paint or shellac.

Oak wilt is caused by a fungus, which is spread by both root grafts and insects. It kills large numbers of oak trees every year in Minnesota. In contrast to Dutch elm disease, which has been very difficult to control, oak wilt can be more readily controlled.

November through March is the safe time for pruning oaks, since the fungal pathogen and insect vectors are inactive. July through October is the low-risk period.

A publication from the University of Minnesota Extension Service titled "Oak Wilt in Minnesota" gives you more details. You can view it on the Internet at It's also available from county offices of the U of M Extension Service. And for a nominal charge, you can order it by calling (800) 876-8636 or (612) 624-4900 in the Twin Cities area. Ask for item 3174.

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