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Japanese Beetles on Japanese Maple: Identification and Control

Identifying the Culprit

Brown, shell-covered beetles skeletonizing your Japanese maple leaves in Charleston, SC are almost certainly Japanese beetles (Popillia japonica). Adults are ⅜-inch long, metallic green with coppery wing covers and distinctive white hair tufts along the abdomen.

Life Cycle & Damage

Adults emerge late June through July
Feeding: Skeletonize leaves (eat tissue between veins) on 300+ plant species
Larvae (grubs): Feed on grass roots, causing dead turf patches

Control Options

Foliar Sprays (Immediate Relief)

Apply every 5-10 days during peak activity:

Carbaryl (Sevin)
Acephate (Orthene)
Pyrethroids: bifenthrin, cyfluthrin, permethrin, etc.

Systemic Soil Treatment (Season-Long)

Bayer Advanced Tree & Shrub Insect Control (imidacloprid) applied to soil provides 12-month protection. Takes 2-3 weeks to reach foliage on large trees—combine with foliar spray for immediate knockdown.

Integrated Approach

Spray now for current beetles, then apply soil systemic for sustained protection. Monitor and repeat as needed.

Trees: Japanese Maple Honeydew and Sooty Mold: Aphid or Scale Infestation; Japanese Maple Transplant Shock and Leaf Scorch; Japanese Maple Lost All Leaves After Planting: Shock or Deer?; Boxelder Bugs Indoors: Exclusion + Perimeter Spray; Dried-Out Japanese Maple Recovery: Mulch, Water, Wait for Spring; Spider Mite Damage on Japanese Maple; Japanese Beetle Devastation on Plum Tree: Systemic Protection; Japanese Red Maple and Japanese Beetles: Manageable Risk; Japanese Beetle Control on Purple Plum Trees; Japanese Maple Leaf Scorch: Recovery and Prevention

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Plants

Transplanting Japanese Maple in NC: Plant Now, Not Spring

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Fertilizing Japanese Maple: Skip Spikes, Use Granular

Plum Tree Leaf Damage: Japanese Beetles and Control Options