Grape Berry Moth
Scientific Name
Endopiza viteana
Host
Grape berry moths feed on grapes, both cultivated and wild species. They prefer tender skinned varieties with tight fruit clusters.
Symptoms
Damage is caused by the larvae feeding in flowers and fruit. Small fruit, when damaged, turn dark purple in color and drop from the stems. Larger fruits are usually webbed into the cluster and shrivel or rot in place.
Life Cycle
This insect overwinters in the pupal stage in its cocoon. The larva forms its cocoon
by cutting out a small piece of leaf and folding it over to form a cavity which it lines
with silk. The cocoon is connected with the leaf at each end by a small, uncut piece
of leaf tissue. The leaf folds containing the cocoons may remain attached to the leaves
or may break off and fall to the ground. The adults emerge in late spring, about the
time grapes bloom (April). Females lay their flattened, circular, cream colored eggs
at dusk, on the fruit, stems, flower clusters, or newly forming grape berries. First
generation larvae feed on flowers or very young fruit clusters. This early activity
is relatively unimportant in most vineyards. Later generations feed on developing
or ripening grapes, often webbing several fruits together. Each larva may destroy
three or four fruits. Development from deposition of the eggs to emergence of the
adults averages about five weeks. There are as many as three generations per year
in Oklahoma.
Description
The adult is a small moth with a wingspread of about 3/8 inch. The front wings are brown with a slight purplish sheen. The head is brown, and the center portion of the forewings may appear to have a dark saddle-like band running across them. Young larvae can be either yellowish green or dull white with a black head capsule. Mature larvae range from olive green to brown in color and are about 3/8 inch long. Caterpillars, when disturbed, wiggle and squirm vigorously to escape and will drop to the ground if possible.
Control
Please contact your local county extension office for current information.