Health Protection, Southern Region
Importance. - Adults and nymphs of lace bugs feed on the leaves of many species of hardwoods throughout the South. Some of the more
common species affected are sycamore, oak, elm, hackberry, and basswood. By the end of August, leaves attacked by these insects may be discolored and
perform little photosynthesis, and may even fall from the tree.
Identifying the Insect. - Nymphs are usually dark colored and covered with spines. Adults have broad, transparent, lacelike wingcovers. They
are flattened, and about 1/4 inch (6 mm) long. Some species are beautifully colored.
Adults on sycamore. (Click for detail. JPG 39K).
Identifying the Injury. - Infested leaves have chlorotic flecks or tiny chlorotic spots on the upper side. Heavily infested trees may be partially
or full defoliated, especially during dry weather.
Biology. - Adults overwinter in bark crevices and similar protected areas of their host. The adults become active during the spring and lay
eggs on the underside of leaves. After the eggs hatch, the nymphs begin feeding on the underside leaves. They feed by inserting their mouth parts into leaf tissue
and sucking the plant juices. A complete life cycle, from egg to adult, may take in 30 to 45 days; several generations may occur each year. In late summer, both
adults and nymphs will be feeding at the same time.
Control. - Natural enemies are usually effective in maintaining populations at a low level and bringing outbreaks under control. Chemical
controls are usually only used on shade and ornamental trees.