Arbor care

Choose trunk injection when soil treatments are impractical or off-target risk is high: near water, on paved sites, in mulched beds shared with shrubs, or when the pest sits high in the canopy. Soil drenches are slower to translocate, and foliar sprays carry drift risk that injection eliminates entirely.

Inject during active sap flow, typically mid-spring through early fall when trees are fully leafed out and transpiring. Uptake slows dramatically in drought-stressed or dormant trees. Water the root zone a day before injecting if conditions are dry to speed uptake and reduce time on each tree.

A basic program needs an injection system matched to your product line, a drill with sharp bits sized to the system's plugs or tees, and the labeled product. Climbing gear is not required since all work happens at the trunk base, which is part of why injection scales well for plant health care routes.

Dosing is based on trunk diameter at breast height (DBH). Measure each trunk, then follow the product label's rate per inch of DBH. Multi-stem trees are dosed per stem. Accurate measurement matters because underdosing produces poor control and overdosing wastes expensive product.

It depends on the active ingredient and target pest. Some systemic insecticide injections protect for one season, while others provide two years or more of control against borers. Build retreatment intervals into client contracts based on the label, not on visual symptoms, since damage often appears after protection lapses.

Most systems work across hardwoods and conifers, but uptake speed varies widely by species, ring porosity, and tree health. Severely declined trees with compromised vascular systems take up product poorly. Assess canopy condition first, because injection is a protection and early-intervention tool rather than a rescue for nearly dead trees.