Maple Tree Limb Crack with Larvae: Remove Limb, Treat Borers

Central Maryland maple has cracked limb with white larvae in trunk-side crack. 2/3 of limb dead. Ants also present.

Diagnosis

Larvae are secondary invaders in the crack, not primary cause. The crack likely existed undetected; insects laid eggs inside.

Remove the limb—2/3 dead means it's a hazard and won't recover.
If saving is essential: Cabling or bolting by an arborist (costly, specialized).
Treat borers: Spray trunk with Merit (imidacloprid) or use Bayer Advanced Tree & Shrub soil drench.

Consult an arborist for structural assessment.

Plant Diseases: Red Maple Borer Infestation: Sap Flow and Bud Failure; Silver Maple Trunk Rot: Don't Foam—Fertilize and Prune Deadwood; Maple Borer Infestation in Old Wound: Treatment and Risk; Pecan Webworms: Trunk Treatment for Tall Trees; Best Mulch for Mature Maple Trees; Saving an Elm Tree from Borer Infestation; Dealing with Borer Damage in Crimson Maple Trees; Borers in Young Maple; Lilac Decline; Old Willow Borers: Insecticide + Fertilizer for Recovery; Co-Dominant Trunks in Maple: Why Early Correction Prevents Future Failure

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