Lace Bugs

Lace bugs are sap feeding insects that are commonly found on shade trees in the area. Their growth and development occurs throughout the summer however, the damage typically isn’t noticed till August when their numbers are at the highest. Both the adults and nymphs feed on the undersides of leaves causing the characteristic copper, scorched or bleached discoloration on the leaf surface. Lace bug adults have attractive wings which have an intricate patter of veins that resemble lace (hence the common name). The wings are flat on top and extend out over the sides of the body. Adults are approximately 3/8-inch long. Nymphs are black, spiny and pointed at both ends.

Damage caused by lace bugs varies greatly from one year to another, probably in response to variations in weather conditions. Most of the time trees can handle the damage caused by lace bugs however, in years with high numbers the damage can cause premature leaf drop and several years of severe feedings can stress the tree. Usually by the time you notice the damage caused by this insect it’s too late to spray and as the damage has already been done. In some cases, spray could be warranted when lace bugs dropping out of the tree onto patios create a nuisance situation. There are several chemicals that can be used to treat for lace bugs including insecticidal soap, horticultural oil, carbaryl, bifenthrin, permethrin or pyrethroids. The last four chemicals are broad spectrum and will kill lace bugs but will also kill natural predators so use with caution. Systemic insecticides are also effective but need to be applied early in the year and should be used with caution.

Have questions? Contact our office where our Horticulture Extension Agent will assist you with questions.

Phone: (316) 321-9660

Email: callae@ksu.edu