There are several different types of leaf beetles. including the common Elm Leaf Beetle. Leaf beetles are often small beetles, about ½ inch long or less, and are generally found on the underside of leaves. The beetles eat the leaf tissue between the veins, giving the leaves a threaded, lacy appearance. The beetles, as they consumer more and more of the leaves, place significant stress on the tree. In the fall, the beetles can also become a nuisance in homes, as they seek shelter for over-wintering.
At the first sign of leaf beetles, spray with Bug Buster Pyrethrin Insect Spray. Repeat the spraying every seven to fourteen days as necessary. In areas of repeated annual leaf beetle infestations, be sure to spray with Bug Buster as soon as the leaves grow to full size in the spring.
If the tree is too tall to spray, treat it with Once-A-Year Insecticidal Drench w/Merit.