Flowering Plum Defoliation: Japanese Beetle Feeding

Plum tree bloomed well, now leaves being eaten away; no bugs seen. Photo shows leaf damage.

Diagnosis: Japanese Beetles

Beetles feed at night/early morning/dusk—often absent midday. Caterpillars would be visible. Damage pattern (lacy skeletonization) matches beetles.

Beetles fly most on clear 84–95°F days, low wind—new arrivals daily.
Aggregation pheromones + damaged-plant odors attract more.
Feed top-down—coverage hard on tall trees.
Pyrethroids/carbaryl may flare mites/aphids; switch to acephate/malathion if needed.
Reapply after rain; short residual life.

Expert insight provided by Steve.

Plant Diseases: Borers in Japanese Plum (Loquat): Identification and Treatment; Japanese Beetle Control on Purple Sand Cherry; Japanese Plum Tree Root Rot Collapse: Fungal Failure and Neighbor Tree Risk; Japanese Plum Tree with Borer Holes: Insecticide or Organic Option?; Japanese Plum Tree Rabbit Damage: Bridge Grafting to Save Girdled Tree; Japanese Plum (Loquat) Yellow Powder on Limbs: Cytospora Canker; Japanese Beetle Devastation on Plum Tree: Systemic Protection; Plum Tree Leaf Damage: Japanese Beetles and Control Options; Borers in Japanese Plum Trees: Identification and Control; Japanese Beetle Control on Purple Plum Trees

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