Borer Damage and Bark Loss on Maple Trees

13-year-old maple shows bark split with sap flow, then large bark piece peels off revealing grubs and ants. Upper canopy thinning. Memphis, TN area.

Diagnosis: Borer Infestation

Borers attack stressed trees (drought, injury, disease). The grubs are secondary; borers caused the damage.

Treatment Plan

1. Spray trunk with Onyx insecticide now and again in April.
2. Fertilize with 10-10-10 at 1 lb per inch trunk diameter, scattered and watered in.
3. Soil-applied option: Bayer Advanced Tree & Shrub Insect Control for season-long prevention.

Wound Care

Remove loose bark only. No wound dressing—slows healing. Monitor for sawdust/fresh holes; re-treat with Onyx if seen.