Laburnum Borer Infestation: Trunk Spray Imidacloprid

Borers in Laburnum: Small Beetles Under Bark Are Secondary

Tiny beetles under loose bark are fungus-feeders, not borers. Real borers are inside wood.

Spray trunk with imidacloprid (Merit, Onyx, or generics) — soaks into bark, kills borers.
Fertilize 10-10-10 at 1 lb/inch trunk diameter to reduce stress.
Active ingredient names: imidacloprid (Admire, Merit, Confidor, etc.). Label must list borer control.

Stress (drought, wound, compaction) invites borers. Fix stress + treat = recovery.

Trees: Bark Stripped Off Post Oak by Kids: Will the Tree Survive?; Mature Laburnum with No Leaves: Death Confirmation; Magnolia Bark Splits: Normal Sloughing, No Treatment; Hackberry Bark Splitting, Powder & Ants: Heart Rot & Insects; Coral Bark Maple Losing Bark: Sunscald, Borers, or Natural Exfoliation?; Maple Bark Peeling: Decay Fungi and Borer Prevention; Borers in Dying Willow: Wire Probing and Systemic Insecticide; Why Girdling a Tree Branch Kills It; Tree Bark Damage from Animals: Assessment and Recovery; Lawn Mower Damage to Young Maple: Wound Care Steps

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