Oak lace bugs
Leaves on white and bur oaks are being fed on by species of lace bugs, Corythuca arcuata, in Hubbard and Becker County in Region I. Lace bug nymphs suck fluids from cells between the lower and upper epidermis of the leaves. Oak leaves turn from dark green to a light "bronzing" color by late summer. Look for cast nymphal skins, black colored nymphs, adult lace bugs with clear "lace-like" wings and excrement on the underside of the leaves during late July through mid-August. Other species of Corythuca feeding on other hardwood plant species are also reported this summer. These pests can cause minor branch die back if repeated feeding is severe.