Borers in Oak Trees: Merit and Systemic Options for Homeowners

Licensing

No license needed to purchase Merit (imidacloprid) or Bayer Advanced Tree & Shrub Insect Control for residential use.

Trunk spray: Merit 75WP or 2F applied to bark where borer activity is seen.
Soil drench (easier, longer-lasting): Bayer Advanced Tree & Shrub Insect Control applied around the base. Roots translocate imidacloprid to the canopy, killing feeding borers and preventing new attacks for a full season.

Apply in early spring before adult borers emerge and lay eggs. Follow label rates exactly.

Trees: Tarmac Around Oak Trees Causes Root Suffocation and Bark Loss; Oak Borer Management: Vigor, Merit Spray, and Japanese Maple Safety; Bagworms on Cypress: Systemic Insecticide Needed for Heavy Infestation; Oak Loopers Defoliating Massachusetts Oaks: Natural Pruning, Support Recovery; Oaks Falling with Internal Decay: Hazard Tree Assessment Needed; Oak Thinning for Acorn Production: Wildlife Management Guide; Saving Young Dogwoods from Borers; Saving an Old Oak from Borer Worms and Carpenter Ants; Controlling Eastern Tent Caterpillars on Oak Trees; Fall Webworms on Oak Trees in Texas

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