Large Maple Borer Infestation: Systemic Insecticide Attempt

Assessing Severe Borer Damage

NH maple with 20-ft trunk section showing ¼" round holes, sawdust (frass), dead bark, dead limbs, dried 1-inch grub remains—severe borer infestation (likely clearwing or flatheaded borer). Tree is heavily compromised.

Only Viable Treatment

Bayer Advanced Tree & Shrub Insecticide (imidacloprid) soil drench—systemic may kill remaining borers before extensive feeding. Best product available for this scenario. Treat unaffected maples preventively.

Realistic Outlook

• Tree may not survive—vascular damage extensive.
• Systemic uptake may be impaired by damage.
• If any treatment works, this one has best chance.

Arborist evaluation recommended for hazard assessment. But if trying to save, imidacloprid drench is the shot.