Because of the behavioral preference of these insects for the undersurface of the leaves, insecticide sprays should be directed at this area for optimum benefit. Some species of lace bugs can do considerable damage to shrubs and trees. Azalea lace bug. Eggs of this introduced insect are laid on the undersurface of leaves, usually along the midrib. Immatures are spiny and feed on the undersurface of the leaves.
Adults have the typical lace-like appearance.
The undersurfaces of the leaves are often discolored, with brown to black spots. This discoloration results from the excrement and cast skins of this insect. Hawthorn lace bug. This insect feeds on numerous plants in the rose family, as well as other host plants. This group is the largest of all of the true bugs, and its members are found on all kinds of vegetation.