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ISA Member
Certified Arborist – TX4602A
Texas Oak Wilt Certified – #TOWQ-436
TRAQ Certified
Member of the Texas ISA
Pesticide Applicator License – #0967351
Texas Dept. Of Agriculture
If your oaks are showing signs of decline, Happy Tree Service can help. Our ISA-certified arborists diagnose, treat, and monitor oak wilt across the Austin metro using the macro flare root injection method approved by Texas A&M Forest Service, suppression trenching to stop root transmission, and ongoing monitoring programs tailored to your property. Oak wilt has hit 76 Texas counties, and Central Texas’s shared root systems mean your trees may already be connected to an active infection. With 30+ years of experience and a Certified Oak Wilt Specialist on staff, we protect your oaks at every stag
Oak wilt, caused by the fungus Bretziella fagacearum, is actively killing oaks across Central Texas. The City of Austin’s Oak Wilt Suppression Program maintains an infection map showing active disease zones across the metro. Texas A&M Forest Service has confirmed oak wilt in 76 counties, and the number keeps climbing.
The fungus invades the tree’s water-conducting xylem, blocking nutrient flow. If you have red oaks, the timeline is brutal: four to six weeks from infection to death. Live oaks decline more slowly, usually over three to six months, which gives you a window to act.
If you have live oaks on your property, the fungus can spread underground through shared root systems at 75-100 feet per year. That kind of loss can reduce your property value by 15 to 20%, according to Texas A&M Forest Service data.
Oak wilt looks different depending on the species.
Here’s what to look for on your live oaks:
If you have red oaks (Spanish oak, Shumard oak), watch for these:
One of the clearest signs is a pattern you can see from the street: trees dying outward from a central point, with nearby oaks declining over a span of months.
Many other conditions mimic oak wilt symptoms, including drought stress, herbicide damage, leaf blister, and insect damage. Choosing the right specialist for that diagnosis is the most important decision you’ll make.
When you’re choosing someone to diagnose and treat oak wilt, credentials matter. Our team has been doing this work across the Austin metro for more than 30 years. Our arborist is Evan Peter (ISA Certified Arborist TX-4602A), who holds the ISA Texas Oak Wilt Qualified (TOWQ) designation. The TOWQ credential, offered through the International Society of Arboriculture in partnership with the Texas Chapter ISA, means an arborist has proven hands-on knowledge of oak wilt biology, identification, and treatment. Both Texas A&M Forest Service and the City of Austin recommend working with a TOWQ-designated arborist for oak wilt diagnosis and treatment. If you’re looking for an ISA certified arborist in Austin, our team carries the credentials that matter most for oak wilt.
Our team has worked oak wilt cases across Travis, Williamson, and Hays counties for decades.
Here’s what that process looks like in practice.
Evan Peter, Certified Arborist – TX-4602A
Our oak wilt treatment follows a four-step process, and every plan is tailored to your property, the infection stage, and the trees at risk.
We inspect your trees on-site, looking at leaf symptoms, the pattern of decline in nearby trees, and how fast the damage is moving. If we can’t confirm visually, we send samples to the Texas Plant Disease Diagnostic Laboratory. We also rule out other conditions like drought, insects, and herbicide damage.
Happy Tree Service uses macro flare root injection, the only method approved and scientifically validated by Texas A&M Forest Service. We excavate the root flare area with an air spade to minimize root damage. We drill injection points into the flare roots, spacing them evenly around the tree. If your trees are healthy but at risk, preventative treatment gives you the best odds, with success rates around 85%. Therapeutic treatments are available for trees that are infected but have lost less than 30% of their canopy, and retreatment may be needed every 12-to-18-month intervals depending on disease pressure.
We cut trenches through the interconnected root systems to stop the fungus from spreading underground. Texas A&M Forest Service sets the minimum depth at four feet. We recommend going deeper where soil conditions allow. We place the trench at least 100 feet past the last symptomatic tree and use rock saws or trenching machines depending on your terrain.
After treatment, we monitor your trees at regular intervals and use deep root fertilization to help them recover. We also keep an eye on neighboring trees for new symptoms. Our tree healthcare services in Austin keep your oaks protected well beyond the initial treatment.
Oak Wilt Treatment Options at a Glance
| Method | Description | When Used | Success Rate |
| Macro Flare Root Injection (Propiconazole/Alamo®) | Fungicide injected through root flares into the vascular system using air spade excavation | Preventative treatment for at-risk trees; therapeutic for early-stage infection (<30% canopy loss) | ~85% preventative; lower for therapeutic (varies by stage) |
| Suppression Trenching | Trenches severing root connections to stop underground fungal transmission | Active infection centers where root graft spread is confirmed or suspected | Effective when placed 100+ feet beyond last symptomatic tree at 4-ft. depth |
| Infected Tree Removal | Removal of dead or dying oaks that serve as fungal mat hosts or spore sources | Red oaks producing fungal mats; trees beyond saving | Eliminates spore source; does not treat surviving trees |
If someone recommends micro-injection for your oaks, here’s what you should know. Macro flare root injection and micro-injection both deliver propiconazole into the tree’s vascular system, but they differ in method, volume, and scientifically documented results.
Macro-injection uses larger volumes of diluted fungicide delivered through the root flares after excavation with an air spade. This provides thorough distribution throughout the vascular system and adequate water volume for full canopy coverage.
Micro-injection uses smaller holes drilled into the trunk with higher-pressure, less-diluted fungicide. The method is less invasive, but it provides less consistent vascular distribution and can cause more localized stress at injection points.
Macro flare root injection is the only method with peer-reviewed scientific data supporting its efficacy, as documented by the Texas A&M Forest Service oak wilt management program. We use macro-injection exclusively. When your trees are on the line, we go with the method that has the science behind it.
Understanding how oak wilt spreads explains why speed and proven methods matter so much.
Oak wilt spreads through two distinct pathways, and understanding both is essential to protecting your property.
If you prune an oak or a mower nicks the bark, that wound is an open door for the fungus. Nitidulid (sap-feeding) beetles feed on fungal mats that form under the bark of dead red oaks, pick up spores, and carry them to fresh wounds on healthy trees. This is the primary way oak wilt jumps to new areas. The beetles are most active from February through June, which is why Austin and surrounding cities restrict oak pruning during this window. Pruning cuts, construction damage, lawn equipment nicks, storm breakage: any wound on an oak can let the fungus in. Paint all oak wounds with wound sealant immediately, no matter the time of year. The City of Lakeway prohibits oak pruning from February 1 through June 30, and the City of Bee Cave enforces fines of up to $500 per day for violations during the restricted period.
If you live in a neighborhood with mature live oaks, chances are your trees share root systems with your neighbors’ trees. The oak wilt fungus travels through those connections at 100 to 150 feet per year. That’s fast. Oak wilt doesn’t stop at property lines, and fences, driveways, and sidewalks don’t sever root connections. The City of Austin maintains an oak wilt infection map showing active disease zones and encourages neighbor coordination for the most effective suppression.
The longer treatment is delayed, the farther the fungus travels.
You don’t have to wait for an infection to start protecting your oaks. These prevention steps can significantly reduce your risk.
When it’s time to prune, our tree pruning services in Austin follow strict sanitation and wound-sealing protocols. Our seasonal tree care services in Austin include oak wilt inspections and preventative treatments throughout the year.
Your oaks don’t have to be the next casualty. Happy Tree Service has spent 30+ years protecting Central Texas trees, and our Certified Oak Wilt Specialist, Miles J. Lefler, leads every treatment plan. We provide free on-site consultations with ISA-certified arborists and macro flare root injection following Texas A&M Forest Service protocols. We also offer suppression trenching that exceeds state minimum depth standards and post-treatment monitoring to keep your trees healthy long term.
From tree healthcare services in Austin to tree removal services in Austin when a tree is beyond saving, we’re here for every stage. We work across Austin, Westlake Hills, Barton Creek, Lakeway, Bee Cave, Cedar Park, Round Rock, Georgetown, Bastrop, Dripping Springs, Pflugerville, and Leander. If you’re in the area, we can get to your property.
Call us today at 512-212-0010 or reach out to us online for a free estimate.
Can a tree with oak wilt be saved?
It depends on the species and how early you act. Live oaks can often be saved if treatment begins before the tree has lost more than 30% of its canopy. Preventative fungicide injection — treating healthy live oaks within 100 feet of a confirmed infection center — carries an approximately 85% success rate. Therapeutic treatment of trees already showing symptoms is possible but less predictable, and success depends on how far the fungus has progressed inside the vascular system. Red oaks are a different story: once symptoms appear, they typically die within four to six weeks and cannot be successfully treated. There is no absolute cure for oak wilt, but early action with the right method gives live oaks a strong chance of survival. That’s why calling a certified arborist at the first sign of symptoms — not after the canopy has collapsed — is the most important decision you’ll make.
What are the signs of oak wilt on a live oak in Austin?
The most recognizable symptom is veinal necrosis: a yellow or brown discoloration that runs along the leaf veins in a distinctive fish-bone or herringbone pattern, while the tissue between the veins remains green. You may also notice rapid leaf drop beginning at the top of the canopy and moving downward, thinning canopy that worsens week to week, and small trunk sprouts emerging from the base of the tree. One of the clearest early indicators is a pattern you can observe from the street: trees dying outward from a central point, with nearby oaks declining in sequence over months. Many other conditions — drought stress, herbicide damage, leaf blister, and certain insects — produce similar-looking symptoms. Accurate diagnosis from a qualified arborist is critical before committing to any treatment plan.
What are the signs of oak wilt on a red oak in Austin?
Red oak symptoms are faster and more dramatic than live oak symptoms. Watch for leaves turning autumn colors — red, brown, or bronze — in spring or summer, which arborists call “flagging.” Full-canopy defoliation can follow within weeks of the first signs. If a red oak on your property died last fall or winter, watch the trunk and root flares in late winter and spring for fungal mats — spore-producing structures that form just under the bark, raise it slightly, and emit a distinctive sweet or fruity odor. Those mats are what attract the sap-feeding beetles that carry spores to healthy trees. Dead red oaks with fungal mats should be removed promptly to eliminate the spore source.
How does oak wilt spread in Austin?
Oak wilt spreads through two distinct pathways. The first is overland transmission by sap-feeding nepticulids beetles, which feed on fungal mats beneath the bark of dead red oaks, pick up spores, and carry them to fresh wounds on healthy trees. Any open wound on an oak — a pruning cut, a mower nick, a storm break — is an entry point. This is why Austin and surrounding cities restrict oak pruning from February through June, when beetles are most active. The second pathway is root-to-root transmission through shared underground root systems. Live oaks in urban neighborhoods routinely graft their root systems together, and the fungus travels through those connections at 100 to 150 feet per year. Fences, driveways, and property lines do not stop it. In Central Texas, where live oaks grow densely and their roots intermingle extensively, root transmission accounts for more than 95% of new infections.
How much does oak wilt treatment cost in Austin?
Fungicide injection costs approximately $150 to $400 per tree, depending on trunk diameter and the number of injection points required. Most homeowners treat multiple trees in a single visit — preventative treatment of the healthy oaks surrounding a known infection center is always more cost-effective than losing those trees and paying for removal. Suppression trenching, used to sever underground root connections and stop the spread of the fungus between trees, is a larger scope project that typically runs between $4,000 and $9,000 depending on the length of the trench, terrain, and any infrastructure (pavement, utilities, fences) that must be crossed. Tree removal for oaks beyond saving adds cost separately. Happy Tree Service of Austin provides free on-site estimates — call 512-212-0010 and we’ll assess your trees and give you a clear, written quote before any work begins.
What is macro flare root injection and why is it the recommended treatment for oak wilt?
Macro flare root injection is the only oak wilt fungicide treatment method validated by peer-reviewed research and approved by the Texas A&M Forest Service. It works by excavating the root flare area at the base of the tree with an air spade, drilling injection points into the flare roots, and delivering a diluted propiconazole (Alamo®) solution in sufficient volume to distribute throughout the tree’s entire vascular system. The high water volume is critical — it ensures the fungicide reaches the full canopy rather than concentrating near the injection site. Micro-injection uses smaller holes drilled into the trunk with higher-concentration, lower-volume fungicide. It is less invasive but provides less consistent vascular coverage, and there are no peer-reviewed studies demonstrating its efficacy for oak wilt specifically. When your trees are on the line, we use the method with the science behind it. Happy Tree Service uses macro flare root injection exclusively.
When should I not prune my oak trees in Austin?
Avoid pruning oaks from February through June. This is peak season for the nitidulid beetles that spread oak wilt spores. Fresh pruning wounds release sap that attracts these beetles, and if they’ve recently fed on a fungal mat, the spores they carry can germinate in that sap and infect the tree. The City of Lakeway prohibits oak pruning from February 1 through June 30. The City of Bee Cave enforces fines of up to $500 per day for violations during the restricted window. That said, any oak wound at any time of year — including accidental nicks from lawn equipment and storm damage — should be painted with wound sealant within 15 minutes of the cut. If you need work done during the restricted months, Happy Tree Service paints all cuts immediately after making them and sanitizes climbing equipment between trees, allowing us to prune safely year-round.
What is suppression trenching and when does my property need it?
Suppression trenching is the mechanical severing of underground root connections between trees to stop the fungus from traveling through grafted root systems. A trench is cut to a minimum of four feet deep — we recommend going deeper where soil conditions allow — and placed at least 100 feet beyond the outermost symptomatic tree in the infection center. This creates a physical barrier that the fungus cannot cross. Trenching is recommended when an active infection center has been confirmed on your property or in adjacent properties and root graft transmission is the primary spread pathway. It does not treat trees that are already infected, but it protects the healthy oaks on the other side of the trench from becoming the next link in the chain. In rock-heavy Central Texas terrain, we use rock saws and trenching machines sized to the job.
How often does oak wilt treatment need to be repeated?
Trees metabolize propiconazole over time, so treatment is not permanent. In lower-pressure situations with stable infection centers, some trees may go longer between treatments. This is why ongoing monitoring is a non-negotiable part of effective oak wilt management. Our post-treatment monitoring program tracks canopy condition, watches for new symptoms in neighboring trees, and determines the right retreatment timing for your specific property. Managing oak wilt without follow-up monitoring is like finishing a course of antibiotics halfway through — the disease doesn’t stop just because the first treatment is done.
My neighbor’s oak has oak wilt — what should I do?
Act quickly and coordinate. Oak wilt doesn’t stop at property lines, and live oak root systems routinely cross them. If your neighbor has a confirmed infection center within 100 to 150 feet of your oaks, your trees are at risk within the next one to two growing seasons. The most effective response is preventative fungicide injection of your healthy live oaks before symptoms appear — this is when the 85% success rate applies. Talk to your neighbor about the shared risk; the City of Austin’s Oak Wilt Suppression Program actively encourages neighbor coordination and maintains an infection map of active disease zones across the metro. Also check immediately whether any of your oaks are already showing early symptoms: leaf vein discoloration, unusual canopy thinning, or early leaf drop in spring or summer. The sooner we can assess your trees, the more options you have. Call 512-212-0010 for a free on-site evaluation.
What credentials should I look for in an Austin oak wilt specialist?
Oak wilt is a complex disease that is frequently misdiagnosed — and a misdiagnosis leads to unnecessary treatment costs or, worse, a missed infection that spreads to neighboring trees. Look for an arborist who holds the ISA Texas Oak Wilt Qualified (TOWQ) designation, which is issued by the International Society of Arboriculture in partnership with the Texas Chapter ISA and signifies proven knowledge of oak wilt biology, identification, and treatment. Both Texas A&M Forest Service and the City of Austin recommend working with a TOWQ-designated arborist for diagnosis and treatment. Additionally, the arborist must hold a Texas Department of Agriculture Pesticide Applicator License to legally apply propiconazole (Alamo®). Happy Tree Service of Austin carries the TOWQ designation (#TOWQ-436), ISA Certification (TX-4602A), TRAQ certification, and a TDA Pesticide Applicator License — the complete credential set for oak wilt work in Texas.
Let me tell you, I got so many different bids and different tree companies to come out and look at my trees. Evan said just a few words and I knew Happy Tree Service was the one. He REALLY knows trees and cares about your trees. We had to make a tough decision about cutting down a tree and he even called his father to get exact instructions so we would be successful at having a branch root and start over with the same tree.
Happy Tree Service trimmed all of our trees today. We have lots of very tall trees and they were in need of a good pruning. The crew showed up this morning, did a great job, cleaned everything up very nicely and all for a fair price. We are very happy with how our trees look and will definitely use this company again. Thanks Happy Tree Service from some happy customers!
My yard was completely overtaken by trees and overgrowth, and Happy Tree Service came to the rescue. They did a great job clearing out the overgrowth and now my yard looks so nice and clean! They also did a really nice job cleaning up my oak trees that had been recently damaged. I appreciate the professional customer service, quick response time, and excellent follow-up of Happy Tree Service!
