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Birch Borer Larvae in Limb: Wound Care and Systemic Protection

Small holes with larvae in birch limb = bronze birch borer. Digging them out is correct. Sap weeping is normal spring pressure—will subside. Don't tourniquet.

Spray wound with imidacloprid (Merit) to kill residual larvae and deter new attacks. Fertilize with 10-10-10 at 1 lb/inch trunk diameter. Healthy birches resist borers better.

Trees: Diagnosing Bark Peeling and Leaf Loss in Birch Trees; Willow Tree Slime Flux: Bacterial Wetwood Diagnosis; Cedar Spruce Sap Sucker Damage: Bird-Caused Holes Misidentified as Borers; Sapsucker Woodpecker Damage on Pine: Identification and Simple Control; Purple Birch Transplant Recovery: Addressing Wire Basket and Watering Mistakes; Maple Sap Dripping After Pruning: Normal or Aphids?; Rows of Holes on Bradford Pear: Sapsucker Activity; River Birch Sap Bleeding from Ice-Damaged Limbs; Birch with Holes and Brown Leaves: Call a Forester; River Birch Sap Flow: Normal Spring Phenomenon, Not a Problem

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