Seasonal development and life cycle
Oviposition begins 2 to 3 weeks after adult emergence and continues for 6 to 8 weeks. A single female
may lay as many as 500 eggs in the soil. These eggs hatch into legless, white grubs that feed on
roots. Larvae require approximately 1 year of development before pupating in the soil during late
winter. Adults emerge as temperatures rise in spring. Along the California coast adults generally
begin to emerge the first week in April and continue through May.
larvae (top) and pupa (bottom)