Japanese Beetles on Thundercloud Plum: Control and Host Range

Two Thundercloud plum trees are covered in small beetles. One died after replacement. Owner asks about spraying and whether beetles attack other plants.

Confirmed: Japanese Beetles

They skeletonize leaves (eat tissue between veins) on over 300 plant species.

Control Options

• Foliar sprays: Carbaryl (Sevin), cyfluthrin, permethrin, acephate, neem oil.
• Soapy water: Direct contact kills but no residual.
• Hand-picking: Shake beetles into soapy water early morning when sluggish.
• Timing: Spray when beetles active (clear days, 84-95°F, low wind). Repeat after rain.

Host Plants (Partial List)

Grapes, raspberries, peach, plum, rose, apple, cherry, corn, soybean, Virginia creeper, hibiscus, hollyhock, dahlia, zinnia, elm, linden, poplar, willow, crepe myrtle, ferns, elder, sassafras, smartweed—and many more.

Neighbors' beetles will migrate to your yard. Consistent management is key.