Tips for treating destructive Japanese beetles
It’s time to keep an eye out for Japanese beetles, one of the most easily recognized and destructive garden pests. In June and July, grubs in the soil of lawns turn into adult beetles that start feeding on foliage.“Japanese beetles are double trouble,” said Sharon Yiesla, plant knowledge specialist in the Plant Clinic at The Morton Arboretum in Lisle. They do damage both in the grub stage, when they eat the roots of grass plants, and at the adult beetle stage, when they feed on many plants’ leaves.Adult beetles feed on about 300 different species of ornamental plants, but especially favor roses, grapevines, and crabapple, cherry and linden trees. They eat the tissue between the leaf veins, leaving just the skeleton of a leaf.Japanese beetles have oval, metallic green bodies about ¼ to ½ l...