Isaacs, MSU Entomology
|The banded grape
bug has piercing-sucking mouthparts that it inserts into plant tissue
to suck out plant sap. It completes one generation per year on grapes
and is active in vineyards from shortly after bud break to early
July. It spends most of the year as an egg, which is the overwintering
stage. Eggs are laid in crevices on second-year wood and vine trunks.
They hatch when shoots are approximately 2 to 5 inches (5 to 13
cm) long. The nymphs then begin feeding on shoot tips and newly
emerged leaves. Feeding is concentrated in the stalks of individual
florets, the buds and the cluster stem. Nymph development takes
about 3 weeks, with adults appearing in early June.
few as one nymph per 10 shoots can cause economic damage. Adults are
predators and therefore do not damage grapes. A smaller green-colored
plant bug, Lygocoris inconspicuous, has similar timing and