Although orange tortrix is found in other areas it is generally considered a pest of grapes in the coastal areas and valleys where there is a marine influence for part of the day. At rest the orange tortrix adult is bell shaped and about 0.5 inch (12 mm) long. The female is orange-brown and generally has a faint V-shaped marking located midwing. The male is similar to the female except that it has darker markings. Eggs are laid in overlapping masses. The straw-colored caterpillars have a tan head and prothoracic shield. They are about 0.5 inch (12 mm) long when mature and very active. If disturbed, they wriggle sideways or backwards and either drop to the ground or hang by a silken thread. There are three overlapping generations per year and all developmental stages of this pest can be present throughout the growing season.