How to Manage Pests

Pests in Gardens and Landscapes

Seasonal development and life cycle—Grape leaffolder

Grape leaffolders have three generations a year (about April - May, June 15 - July 15, and August). After overwintering as pupae, moths emerge in April or May and lay flat, elliptical eggs singly on either the upper or lower surface of the leaf. Many are deposited against the leaf veins on the underside of the leaf. After hatching, larvae feed between two webbed leaves for about 2 weeks. Then each pale green larva rolls a leaf edge and feeds from the inside on the leaf edge. Larvae turn darker green as a result of this leaf feeding. If disturbed, larvae wriggle vigorously and drop to the ground without a silken thread. Mature larvae construct a separate leaf envelope on the edge of a leaf in which they pupate.

Grape leaffolder adult
Grape leaffolder adult

Egg
Egg

Larva
Larva
Prepupa
Prepupa
Pupa
Pupa

Statewide IPM Program, Agriculture and Natural Resources, University of California
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