They prefer evergreen varieties but attack deciduous varieties and mountain laurel. Sap removal by adults and nymphs causes a spotting visible on the upper leaves. In heavy infestations, leaves may be white an drop prematurely. Spots of their tarry excrement build up on the under sides of the leaves. The lacy wings of the adults have dark brown to black markings, nymphs are black and spiny.
Populations are greatest in mid- to late summer as the second generation bugs appear.
Sycamore lacebugs have the same general life cycle as the azalea lacebug. In addition to symptoms on the foliage, the insects may fall from the trees onto people below. Some people may have a slight reaction to the bite but the insects are not a health threat. Insecticides such as Insecticidal Soap, Summer Horticultural Oils, Dursban, Malathion, Orthene, Sevin may be used depending on the species or cultivar. Always read product labels carefully before purchase.