Seasonal development
and life cycle—Weevils
Females can produce eggs without mating, commonly laying them on or into soil near host plants. The female adults must feed for about a month before laying eggs. The larvae develop in soil through 6 instars over a period of 2 to 8 months. They are whitish grubs with a brown head and commonly have a C-shaped posture.
Black vine weevil overwinters primarily as a late-instar larva. A few individuals of this and other species can overwinter as adults. Weevils overwintering as late instars form pupae in spring. Adults emerge from the soil about 2 weeks after pupation and begin feeding during the night. | 
Black vine weevil pupa (left) and larva (right)
Fuller rose beetle pupa (left) and larva (right)
|
