Your tree looks sick. Leaves are dropping in July when they should be green and full. There are weird spots on the foliage, or sticky stuff dripping onto your driveway. You google "tree spray service near me" and now you are staring at a list of companies promising they can save it. Now what?
Sometimes spraying a tree works really well. Sometimes it is the wrong move and a waste of money. And sometimes the honest answer is that the tree is already past the point where any product is going to bring it back.
I run a tree service in north Alabama, and we get calls about sick trees every week from March through October. The conversation usually starts the same way. "What can you spray on my oak to make it better?" My answer is always the same. It depends on what is wrong with it. Spraying a tree without a diagnosis is like taking antibiotics without knowing if you have a bacterial infection.
This post covers what tree spray actually is, which problems it can fix, and what to expect to pay in the Huntsville area.
When tree spraying actually works (vs when it is too late)
The biggest factor in whether tree treatment works is timing. Not just the time of year, but how far along the problem is when you call somebody.
Spraying works well when the pest is active and exposed (caterpillars on the foliage, aphids on the new growth, scale before they form their hard outer shells), when the disease is early stage and has not yet caused significant dieback, or when the tree is healthy and you are doing preventive treatment for a known seasonal problem like dormant oil for scale.
Spraying does not work when the tree already has more than 40 percent canopy dieback, when there is significant trunk decay or mushrooms growing on the root flare, when roots are damaged from construction or flooding, or when the diagnosis is just wrong. I see that last one all the time, somebody spraying for a fungal disease that turned out to be a root problem.
The first step in any treatment plan is figuring out what is actually wrong. A good arborist consultation costs less than most people expect and tells you whether spraying is even the right move.
Common Huntsville tree diseases that are treatable
Here are the disease problems we see regularly in north Alabama that respond to treatment when caught early. For a broader overview of what local trees deal with, our guide on common tree diseases in north Alabama covers the full list.
Bacterial leaf scorch on oaks
Bacterial leaf scorch shows up on water oaks, willow oaks, and pin oaks across older Huntsville neighborhoods like Five Points, Blossomwood, and Twickenham. Leaves develop a brown burned edge with a yellow band between the brown and the green, and the symptoms get worse every summer until the tree slowly declines. There is no cure, but oxytetracycline trunk injection done annually suppresses the bacteria and extends the tree's life by years. On a high-value mature oak, it is worth trying.
Anthracnose on sycamores and dogwoods
Anthracnose causes brown blotches on leaves and dieback of new shoots, especially after wet springs. Dogwoods get hit hard, and we see a lot of it in shaded yards in Hampton Cove and Monte Sano where airflow is poor. Treatment is foliar fungicide applied at bud break and again two to three weeks later. Chlorothalonil and propiconazole are the active ingredients that work. One season usually does not fully solve it, but consistent applications combined with raking infected leaves in fall make a real difference.
Powdery mildew on crepe myrtles and dogwoods
That white powdery coating on crepe myrtle leaves in July is powdery mildew. It rarely kills the tree, but it disfigures the foliage and reduces flowering. Propiconazole or myclobutanil knocks it back. Better long-term solution is replacing susceptible varieties with mildew-resistant ones like Natchez or Tuscarora when you next plant.
Apple scab on crabapples
Crabapples in north Alabama yards almost always get apple scab. Olive-green spots on leaves, premature defoliation by August, fruit covered in scabby lesions. Fungicide applications starting at bud break, repeated every 10 to 14 days through wet spring weather, control it. Captan and myclobutanil are common. On a non-fruiting ornamental crabapple, planting a resistant cultivar is cheaper than spraying every year.
Hypoxylon canker (early stage only)
Hypoxylon is a fungus that attacks oaks already stressed by drought, construction damage, or root compaction. Once you see the tan or silvery fungal mats on the bark, the tree is too far gone. Catching the underlying stress early, watering during drought, mulching, and avoiding root damage, prevents it from establishing. After visible cankers appear, removal is the only real option.
Common Huntsville tree pests that are treatable
Insect problems are usually easier to treat than diseases because the targets are physical, exposed, and have predictable life cycles.
Bagworms
Bagworms attack Leyland cypress, junipers, and arborvitae across north Alabama. By the time you see the little brown cone-shaped bags hanging from the branches, the caterpillars are already feeding inside. Treatment is a foliar spray, Bt (Bacillus thuringiensis) for early-stage caterpillars or spinosad for later instars, applied in late May through June. Once they seal their bags in late summer, sprays do not penetrate.
Cankerworms and inchworms
The springtime defoliators that strip oak and maple canopies in late March and April. We covered these in detail in our post on cankerworms in north Alabama. Foliar Bt spray applied while caterpillars are small works well, but you need bucket truck reach to get coverage on a 60-foot oak. Trunk injection of emamectin benzoate is another option for repeat infestations.
Aphids
Aphids cluster on new growth and produce sticky honeydew that drips on cars and patios. Tulip poplars and crepe myrtles are common targets in Huntsville. Light infestations get controlled by lady beetles and lacewings without any treatment. Heavy infestations respond to imidacloprid soil drench, which is taken up systemically and lasts most of a season.
Scale insects
Scale shows up as small bumps on twigs and branches, often with sooty mold growing on the honeydew. Crepe myrtle bark scale has spread across the southeast and we see it constantly in Madison and Hampton Cove. Dormant oil applications in late winter smother overwintering scale, and systemic imidacloprid or dinotefuran soil drench in spring kills emerging crawlers.
Spider mites
Hot dry summers in north Alabama bring spider mites, especially on spruce, juniper, and burning bush. The first sign is dusty or bronzed-looking foliage, then fine webbing on the undersides of leaves. Miticides like abamectin or hexythiazox knock them down. Treatment in July and August is most effective.
Emerald ash borer
EAB has been spreading through Alabama and is documented in several counties in the northern part of the state. If you have ash trees, treatment with emamectin benzoate trunk injection every two years is the gold standard for prevention. Once a tree shows more than 50 percent canopy dieback from EAB, removal is the right call.
Pine bark beetles
Southern pine beetles and Ips beetles attack stressed pines, particularly during drought years. We covered the warning signs in our pine tree problems in north Alabama guide. Once the beetles are inside the tree, sprays do not reach them. Preventive bark sprays of permethrin or carbaryl on high-value pines during active beetle pressure can prevent attack.
What "tree spray" actually means
Tree spray is a generic term that gets used for a few different application methods, and they are not interchangeable. Knowing the difference matters because the right method for your problem might not be a spray at all.
Foliar spray is what most people picture. Liquid product applied to the leaves and branches. Works well for surface pests and contact fungicides, but coverage on tall trees is hard, and drift onto neighbors is a real concern.
Soil drench is liquid product, usually a systemic insecticide like imidacloprid, poured into the soil at the base of the tree. The roots take it up and distribute it through the vascular system. Slower than foliar, but it reaches the entire canopy of even very tall trees and lasts much longer.
Trunk injection is the most precise method. The applicator drills small holes in the trunk and injects measured doses of product directly into the vascular tissue. Almost no drift, very effective for systemic problems, but more expensive per tree.
Basal bark application is sprayed on the lower trunk and absorbed through the bark. Used for some specific pest and herbicide applications, less common for general tree health work.
The trunk injection method
For big trees in residential settings, trunk injection is usually the best tool we have. No spray drift onto the neighbor's vegetable garden. The product reaches the upper canopy reliably. The dose is measured precisely instead of estimated. And the active ingredients are typically more effective per gram than the same compound applied as foliar spray.
The downsides are real too. Injection wounds the tree, although the wounds heal over and trees tolerate occasional injections fine. The equipment is more expensive, and injection takes 20 to 45 minutes per tree for a large oak.
Common injection products include emamectin benzoate (TREE-age) for borers and caterpillars, imidacloprid (Imicide, Pointer) for sap-feeding insects, propiconazole (Alamo) for oak wilt and certain fungal diseases, and oxytetracycline (Bacastat) for bacterial leaf scorch. The application has to match the diagnosis and the pest's life cycle.
The spray timing question
This is the part homeowners usually do not realize. The same product applied at the wrong time of year accomplishes nothing. Timing windows are narrow.
Dormant oil sprays go on in late January through early March, before buds break, while overwintering scale, mites, and insect eggs are still on the bark. One of the most cost-effective treatments in the whole tree care toolbox if your trees have a scale or mite history.
Bud break fungicide sprays for anthracnose and apple scab happen as new leaves emerge in March and April. A second application two or three weeks later catches the second infection cycle.
Growing season pest treatments hit when the target insect is active and exposed. Cankerworms in March and April. Bagworms in late May through June. Aphids May through July. Spider mites in the heat of July and August. Soil drench imidacloprid in fall sets up next spring's protection.
Calling a tree service in October because your oak's leaves looked weird back in May is usually too late for that season's problem. The window has closed.
DIY spray vs professional treatment
For shrubs, small ornamentals, and modest-sized crepe myrtles or dogwoods, a homeowner with a backpack sprayer and an over-the-counter product can do real good. Bonide and Spectracide make decent residential products. Bt for caterpillars, neem oil for soft-bodied insects, copper fungicide for disease pressure.
The problem is reach. A 60-foot water oak in your front yard cannot be sprayed from the ground with a homeowner sprayer. The product gets a few feet up into the canopy and stops. Most pests and diseases live in the upper canopy. You spend money on chemicals that never reach the target.
The other issue is licensing. Many of the more effective products, especially systemic insecticides used in soil drench and trunk injection, are restricted-use pesticides under Alabama law. A homeowner cannot legally buy or apply those products.
Cost ranges for tree spray service in Huntsville
Pricing varies based on tree size, product used, and how many trees are treated in one visit. Here are honest ranges for what we see in the Huntsville market.
Single tree foliar spray treatment usually runs $75 to $300. The lower end is a small ornamental treated with a common fungicide. The upper end is a large oak getting a specialty product or a property where access is difficult.
Whole property dormant oil applications typically fall between $200 and $600 for an average residential lot. One of the better values in tree care because one visit covers a lot of ground.
Trunk injection on a large oak or ash usually costs $150 to $500 per tree. Specialty products like emamectin benzoate are expensive, and the per-tree time is significant. For a high-value mature tree, it is still cheaper than removal and replacement.
Multi-tree packages and seasonal programs are priced lower per tree than one-time visits. A property with five or six oaks getting cankerworm spray and dormant oil might pay $500 to $900 for the whole annual program.
Red flags - "preventive spray" packages that are scams
Not every company offering tree spray service is legitimate. Watch for these warning signs.
Door-to-door pitches for "preventive" spray with no diagnosis. The salesperson glances at your trees, tells you they need treatment, and offers a discount if you sign today. Real arborists do not sell treatment without identifying the problem first.
Vague chemical descriptions. The estimate says "tree treatment" or "spray application" without naming the active ingredient. Legitimate companies tell you exactly what is being applied and why. Ask for the product name if you want to verify.
Annual contracts for general "tree health" with no specific diagnosis. No condition requires year-round preventive spraying on a healthy tree. If your trees do not have an active or recurring problem, they probably do not need a recurring spray program. Healthy soil, mulch, and proper watering do more for tree health than any spray product.
Pressure to treat "before it spreads." Some diseases do spread. But the right answer is diagnosis first, treatment second. A company pushing immediate treatment without identifying what they are treating for is not acting in your interest.
When spraying will not save the tree
This is the conversation I have several times a year. A homeowner has been calling spray companies trying to save a tree that is already too far gone. The money is wasted, and the delay in removing the tree creates a real safety risk.
Signs that no spray is going to bring the tree back. More than 40 percent of the canopy is dead or has no leaves during the growing season. Mushrooms (shelf fungi like Ganoderma or honey fungus) growing on the trunk or root flare. Large cracks running vertically up the trunk. Significant trunk cavity with internal decay. Roots severed by recent construction. The tree is leaning more than it used to and the soil on the high side is heaving.
Once those signs are present, the tree has structural problems no spray product can fix. The right call is an honest assessment from a qualified arborist about whether the tree can be retained safely with pruning and monitoring, or whether removal is the safer option.
The certified pesticide applicator requirement in Alabama
This is worth knowing if you are hiring somebody to spray your trees. In Alabama, anyone applying pesticides commercially has to hold a certified applicator license issued by the Alabama Department of Agriculture and Industries. The category covering ornamental and turf pest control is Category 3.
A legitimate tree care company will have one or more licensed applicators on staff and will apply products under that license. You can ask to see proof of certification, and you can look up applicators on the Alabama Department of Agriculture and Industries website to confirm they are current.
The license requires passing exams on safe application, label requirements, and pesticide laws. It creates accountability if drift damages a neighbor's garden or pets are exposed, and gives you legal recourse if products are applied improperly. Companies that operate without licensing are usually cheaper, but you have no protection if anything goes sideways.
What I would do if I were you
If your tree looks sick, here is the order I would go in. Walk around the tree and take photos of the symptoms. Leaves, bark, base, surrounding soil. Note when you first noticed the problem. Get a qualified arborist or licensed applicator to look at it before you authorize any treatment. Match the treatment to the diagnosis. If the diagnosis says spraying will help, do it at the right time with the right product. If the diagnosis says the tree is past saving, accept that and plan for removal.
For trees in Huntsville and the surrounding communities, we cover treatment, diagnosis, and the call about what to do next. Some trees we save. Some we have to take down. Either way, you get a straight answer.
If you have a sick tree and you want a professional eye on it before you spend money on spray treatments, give us a call. A good oak care plan or a properly timed dormant oil application can add decades to a tree's life.