Honeylocust and black locust trees are susceptible to infestation by the honeylocust plant bug. These stunted and deformed leaves were caused by early spring feeding of the honeylocust plant bug. Such damage is seldom harmful to the tree, but it is unsightly and may cause twig dieback. Lacebugs are one of nature s little wonders. Under magnification, they are revealed as princesses of the insect world.
Nobody knows why they are so delicately decorated.
Unfortunately, several lacebug species, pretty as they are, are devilish plant pests. Adult lacebugs may fly to other hosts and may not be seen when plants are examined. However, their prior activities are confirmed by black, shiny spots of excrement and spiny cast skins on the underside of damaged leaves. The upper surfaces of lacebug damaged leaves show a coarse stippling. Azalea, andromeda, sycamore, and oak are the most common ornamental plants which can develop lacebug problems.