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Paint All Wounds on Oaks Immediately!
Prevention
Paint oak wounds
A thin coat of pruning seal coats wounds so spores can't stick to the sap and germinate. Seal all oak wounds immediately with pruning paint, regardless of the season. Most wounds occur through pruning, but lawn mower scrapes and broken branches should also be sealed as well as the tops of freshly cut stumps.

When pruning, spray each wound right after you make the cut so none are missed. There is no need to seal old wounds because they dry out within a few days. Pruning seal is not recommended for trees other than oaks.

Supplies
You can buy pruning seal at most hardware stores that carry garden supplies. A device called Pruner's Pal allows you to spray cuts made with a 14-foot-pole pruner. A few local garden supply stores carry Pruner's Pals, but they're hard to find, so call first. You can add a little hardware to your pole pruner for less than $10, but it's awkward and you should keep plenty of extra spray can tips on hand!



This is the official City of Lakeway website in Lakeway, Texas. City of Lakeway, TX - Official Website. Here is the site's home page: Information about the City of Lakeway and community including city departments, City Council, parks, and police. Also includes city history.