Light Green Spikes on Maple Leaves: Eriophyid Mite Galls

Identification

Pale green, spike-like projections on maple leaves are galls induced by eriophyid mites (or aphids/scale). The mites feed on leaf tissue, triggering abnormal growth. Common in spring.

Minimal Impact

These galls are cosmetic. The tree suffers little harm. No curative spray exists once galls appear.

Preventive Care

Apply organic fertilizer with compost tea and humic acid to offset minor stress. Next spring, two weeks after bud break, a permethrin-based spray can reduce mite populations if desired.