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Japanese Beetles on Young Weeping Willow: Dual Control

Year-old weeping willow hit by Japanese beetles. Insecticidal soap yellowed leaves. Safe pesticide?

Two-Pronged Approach

Immediate: Foliar spray acephate (Orthene)—covers all foliage/stems. Knocks down current beetles.
Season-long: Soil-applied imidacloprid (Bayer Advanced Tree & Shrub Insect Control). Drench now; translocates in 2–3 weeks for next generations.

Why Not Soap?

Soap can burn tender leaves, especially in sun.
Short residual; beetles return daily.

Resource

Bayer product: link

Bottom Line

Spray Orthene now + drench imidacloprid for season-long protection. Soap is weak and phytotoxic.

Trees: Pine Bark Beetles in Alabama: Prevention via Tree Vigor—Contact Extension for Local Advice; Bronze Birch Borer: Systemic Protection for Birch and Neighboring Trees; Boxelder Bugs Indoors: Exclusion + Perimeter Spray; Japanese Beetle Devastation on Plum Tree: Systemic Protection; Plum Tree Leaf Damage: Japanese Beetles and Control Options; Fig Tree Pest Management: Naturally Resistant; Japanese Beetles on Thundercloud Plum: Control and Host Range; Willow Flea Beetles: Contact Insecticide Control; Japanese Red Maple and Japanese Beetles: Manageable Risk; Catalpa Tree Borers: Bronze Birch Borer Likely—Trunk Spray Required

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