Short answer: do not prune or wound oaks in Texas from February through June, and paint any fresh cut on an oak right away, whatever the month. For most other trees, Texas A&M AgriLife points to December and January, when trees are dormant and pruning is less stressful for them. The reasons and the exceptions are below, with sources at the end.
The oak rule: skip February through June
Texas A&M Forest Service advises avoiding pruning or wounding oaks from February through June. During those months, pruning should only be considered when there is an immediate safety concern.
The reason is oak wilt, a fungal disease of oaks. Red oaks killed by oak wilt the summer or fall before can form fungal mats under the bark in spring. Those mats attract small sap feeding beetles, and the beetles can carry spores to a fresh wound on any oak, healthy or not. A clean pruning cut made in April is exactly the kind of fresh wound they find.
Outside February through June, this guidance does not restrict oak pruning. Fresh cuts still get painted.
Paint every fresh oak cut, in any season
Texas A&M Forest Service says any fresh wound on an oak should be painted, regardless of season. The Texas A&M AgriLife oak wilt guide says wounds should be treated immediately with wound paint or latex paint, and that includes pruning cuts, freshly cut stumps and damaged surface roots.
After a storm the rule shifts slightly. Storm wounds that are no longer fresh do not need paint, but any new cut made during the cleanup must be painted immediately.
Which oaks are most at risk
- Red oaks are the most susceptible. Texas A&M Forest Service says an infected red oak can die within about a month.
- Live oaks have intermediate susceptibility.
- White oaks are the least susceptible, but not immune.
- Live oaks and white oaks can also pass the disease to neighboring oaks through connected roots, called root grafts.
When to trim other trees in Abilene
For most trees, the Texas A&M AgriLife Extension office in Williamson County calls December and January ideal pruning months, because trees are not actively growing and the work is less stressful for them. Winter is also a good time to look a tree over, remove dead limbs, and cut back limbs that rub a roof or wall.
That is general Texas guidance, not a rule written for Abilene or for every species. If a tree is flowering, fruiting or looks sick, ask before cutting. The Taylor County AgriLife Extension office is at 1982 Lytle Way in Abilene, (325) 672-6048.
When a limb cannot wait
A cracked or hanging limb over a roof, driveway or walkway is a safety problem, and the February through June guidance allows pruning when there is an immediate safety concern. If an oak has to be cut in those months, paint the cut right away.
Limbs touching power lines are a job for your electric utility. Keep everyone without utility training away from them.
Three questions to ask before anyone prunes your oaks
- Will you avoid pruning my oaks from February through June unless there is a safety issue?
- Will you paint every fresh cut on an oak right away, in any month?
- If a tree looks sick, should we have it identified first? Texas A&M Forest Service or the county Extension office can help with that.
Getting oak trimming done in Abilene
Big Country Tree Pros passes quote requests to an independent local tree service. If you have oaks that need work, say which trees are oaks when you send the request, and plan the job outside February through June when you can. More on tree trimming in Abilene and oak wilt in Abilene.
Get a Free Tree Quote in Abilene
Tell us what the tree is doing. Your request goes to an independent local tree service, which contacts you with a quote. Big Country Tree Pros does not do the tree work itself.