Description
Adult: 5-7 mm wingspan; forewings have cream-white color with gray, black and brown markings; hind wings are white (male) or dark gray (female).
Larva: Up to 10 mm long; body yellowish-green to grayish-green; skin may be translucent leaving the gut visible; head and thoracic plate brownish-yellow; caterpillar is very agile when disturbed.
Pupa: 5-6 mm long, brown.
Eggs: Lentil-shaped, 1 mm long; color initially yellowish and later turns grey; eggs are found on stems and berries.
Damage
Larva-fed grapes may turn brown, mold or rot.
Webbed inflorescences, fruit clusters and leaves.
Presence of larvae on flower buds, developing fruits and mature berries.
Lifecycle
The moth has two to four generations per year and is active from early spring to late summer. A female moth deposits one or a few eggs on or near buds, pedicels, flowers or fruits of host plants. Larvae spin silken webs to tie leaves, inflorescences or fruit clusters. The spring generation larvae feed on flower buds and pupate within webbed plant parts. The summer generation larvae feed on and pupate in berries, which predispose berries to molds and rots. The moth overwinters as a pupa at various locations such as under leaf litter, in the soil and under grapevine bark. Adults feed on nectar.
