Hot take: When should you really prune an oak? The old rule vs. new science

Got into it with a guy at the local landscape supply last week. He's 65, been doing tree work since he was a kid, and swears you should never touch an oak between April and October because of oak wilt. But then I watched a webinar from a university in Texas that said if you seal the cut right away with proper paint, you can prune oaks all summer with almost zero risk. My crew has always followed the old school way (cut only in winter), but I'm starting to wonder if we're losing work and leaving trees in bad shape for 6 months at a time. Who's got real experience trying summer pruning on oaks with wound dressing?

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derek_bell1mo ago

Yeah see that's the thing, the old rule isn't really about oak wilt for most of the country. Oak wilt is a real problem in the Midwest and Texas but it's almost nonexistent in a lot of other regions. The bigger risk from summer pruning is actually the beetles that spread the disease. They're attracted to fresh cuts and open wounds, not the season itself. So if you seal a cut right away with a proper pruning paint, you're blocking those beetles from landing on it. I've tried it on a few jobs in July where a branch was hanging over a roof and the homeowner couldn't wait. Just made sure to paint within 10 minutes and never had an issue. But I still stick to winter for big cuts because it's less stress on the tree overall. The university guys are right that paint works but I don't think the old timers are wrong either.