and life cycle—Western grapeleaf skeletonizer
The western grapeleaf skeletonizer has three generations per year in the Central Valley and two generations
in the cooler coastal regions. Adults of the first generation in the Central Valley emerge from hibernating
pupa in early spring to June. The pale yellow or whitish capsule-shaped eggs are laid in clusters on
the underside of grape leaves. After hatching, the larvae line up and feed side by side on the leaf underside
until the early fourth instar stages. There are five larval stages. When mature, larvae crawl under the
loose bark or into ground litter and spin a dirty, whitish cocoon to pupate.
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