Why trunk injection is the gold standard for systemic problems
For systemic pathogens (oak wilt, bacterial leaf scorch) and chronic nutrient deficiencies (iron chlorosis in our alkaline DFW soils), trunk injection delivers the active ingredient directly into the tree's vascular system. Within days, the product distributes throughout the canopy via xylem transport. Compare this with foliar sprays (limited canopy reach, weather-dependent, no systemic effect) or soil applications (slow, inefficient in alkaline clay, affects non-target organisms). Injection is the protocol of choice when the target is inside the tree.
Propiconazole — oak wilt preventive and therapeutic
Brand-name Alamo (and generics). Macro-infusion at 2 mL per inch DBH for preventive treatment, 4 mL per inch for therapeutic. Administered via 9-port injection manifold at the trunk base, gravity-fed over 1-3 hours. Treatment interval: every 24 months for high-value live oaks in oak wilt centers, every 12 months for confirmed-infected trees. Highly effective at slowing disease progression in early-stage cases.
Oxytetracycline — bacterial leaf scorch annual treatment
Brand Bacastat or generic OTC. Trunk injection at 0.4 grams active ingredient per inch DBH, applied annually. Best window: spring before bud break or early summer when full canopy is up. Will not cure BLS — it suppresses bacterial population enough to extend the tree's functional life by 5-15+ years. Diagnosis confirmation via PCR test at Texas Plant Disease Diagnostic Lab is recommended before starting treatment.
Chelated iron + manganese — chlorosis correction
Mauget or similar implants. Iron + manganese in chelated form delivered via micro-injection ports every 6-8 inches around the trunk. Initial response visible within 4-8 weeks (greening of newly-emerged leaves). Treatment lasts 1-3 seasons depending on soil severity. We typically retreat at season 2 for chronic cases.
Emamectin benzoate — boring insect prevention
Brand TREE-äge. Effective against emerald ash borer, certain bark beetles, and lepidopteran wood-borers. Annual or biennial macro-infusion. We use it preventively on heritage ashes (where EAB has now been confirmed in north Texas) and on stressed pines in pine bark beetle pressure zones.
Imidacloprid — systemic insecticide for sucking pests
Brand Merit, Trans-Inject, or generics. Trunk injection for aphid and scale infestations where soil applications would be slow or environmentally problematic. Distributes systemically and provides season-long control with a single application.
What we never inject without justification
We do not inject trees that don't need treatment. Every injection involves drilling small wounds, and unnecessary injection is a net negative for tree health. Our diagnostic visit determines whether injection is the right tool — sometimes a watering change, soil aeration, or cultural intervention is the actual fix and we recommend that instead.