The oak wilt calendar: why we won’t prune your oak in April
The one piece of tree scheduling every oak owner in Montgomery County should know.
What oak wilt is
Oak wilt is a fungal disease that plugs an oak’s water-conducting tissue until the crown starves. It is established across much of Texas, and it plays favorites: red oaks die fast — often within weeks of showing symptoms — while live oaks decline over months and spread the fungus to each other through connected root systems. Once it’s in a live oak grove that shares roots, it moves tree to tree underground, and whole neighborhoods have lost their canopy that way.
How it spreads — and where pruning comes in
Above ground, the fungus rides sap-feeding beetles that are drawn to fresh wounds. In spring, the beetles are flying, the fungal mats they visit are producing spores, and a fresh pruning cut is an open door. That combination is why the Texas A&M Forest Service recommends not pruning oaks from February 1 through June 30, and painting every oak cut — any season — the moment it’s made. Those are the two rules we run on every oak job, no exceptions, which occasionally makes us the bearer of boring news in May. The tree is worth the wait.
The short version
Oaks: prune July–January only, paint every cut immediately. Everything else (pine, sweetgum, elm, pecan): normal scheduling applies.
Symptoms worth a phone call
On live oaks, the tell is veinal necrosis — leaves whose veins turn yellow then brown while the rest of the leaf stays green for a while. On red oaks, watch for a crown that wilts and browns section by section in late spring, dropping dull green leaves. Neither is a guaranteed diagnosis — drought stress and root damage mimic both — but either one on an oak in this county deserves eyes on it. The Texas A&M Forest Service maintains the definitive symptom guides and a network of certified oak wilt specialists for lab confirmation.
The firewood rule
Fungal mats form under the bark of red oaks that died of the disease — which makes unseasoned red oak firewood a traveling infection source. Don’t stack fresh red oak against living oaks, don’t haul mystery firewood in from wilt counties, and if you burn oak, burn it fully seasoned. It’s an unglamorous rule that protects entire streets.
What this means for scheduling us
Simple: oak trimming books July through January. Dead limb over the roof in March? Genuine hazards get handled — hazard mitigation with immediate paint is different from elective pruning, and we’ll tell you honestly which side of that line your job sits on. Removing a confirmed-dead oak is fine any month; it’s the cuts on living oaks that follow the calendar.
Not sure what your oak is telling you?
Send photos or book a look — the assessment costs nothing.