In fall and spring, elm leaf beetles may become a serious nuisance in homes. The adults invade homes in the fall, seeking a place to hibernate, and they become a nuisance again in spring as they come out of hibernation. They are yellowish to olive-green with a black stripe along each side of the wing covers. They can fly but are generally rather sluggish. The adult females lay their yellow eggs in clusters of 15 to 35 on the undersides of elm leaves.
Young larvae are nearly black and are covered with short, black hairs.
Their heads are a distinct black and they have three pairs of black legs. Pupae are usually found lying on the ground at the bases of infested trees. At this stage, they are immobile and have no distinct head or appendages. How to Control the Beetle Control on the tree may be accomplished by using foliar sprays. For the best control, apply the chemical right after egg hatch.