NC State Extension Publications

Description and Biology

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The oak lace bug, Corythucha arcuata, is an occasional pest of oaks in the landscape. Adults are 1/8 inch long and tan with darker brown spots. Veins divide the wings and extensions of the thorax into tiny polygons that resemble lace. Lateral extensions of the thorax give the oak lace bug an almost rectangular outline in top view. Oak lace bug nymphs are smaller than adults and are mottled and spiny. Each female lays her eggs on the lower leaf surface in groups of 25 to about 50. Each minute egg is dark brown and shaped like a conga drum. Tiny nymphs hatch and feed together as they grow and molt four times before maturing. Several generations occur each year. Adults overwinter in sheltered areas of bark or in other crevices.

Oak lace bug adult

Oak lace bug adults are about 1/8 inch long.

Oak lace bugs lay their eggs in groups.

Oak lace bugs lay their eggs in groups.

Oak lace bug nymphs

Oak lace bug nymphs are dark and spiny.

Host Plants

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Oaks, especially white oak and burr oak are host plants of this lace bug. Oak lace bugs feed on the lower leaf surface and cause yellow or pale spots to appear on the upper leaf surface. This damage is somewhat like thrips injury, but lace bug injury is coarser. Lace bugs also leave "fly specks" or excrement on the lower leaf surface (this is one way to tell lace bug damage from spider mite damage - spider mites don't leave noticeable "fly specks"). If much feeding occurs, the leaves may become almost bleached out. Oak lace bugs are reported to cause leaf curl and premature leaf drop when they are abundant.

Oak lace bugs cause pale spots

Oak lace bugs cause pale spots to form on oak leaves.

Residential Recommendations

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Lace bugs are relatively difficult to control. Although the leaf damage caused by oak lace bugs may be alarming, pesticide treatment is usually not necessary. If the infested tree is small enough to treat and if it is of high value to the landscape, most of the pesticides labeled for landscape use should give adequate control if applied thoroughly.

References

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For assistance with a specific problem, contact your local Cooperative Extension Center.

This Factsheet has not been peer reviewed.

Author

Professor Emeritus
Entomology

Publication date: July 21, 2016
Revised: Oct. 7, 2019

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