Latin name: Otiorhynchus sinularis
Reason for Concern:
1) Damage in early spring by adult clay colored weevils feeding on unopened buds.
2) Damage is often mistaken for winter injury.
3) Larvae (grubs) feed on the roots and weaken cane growth.
Larvae are white or pink, legless, "C" - shaped grubs that feed on roots most of summer and winter. Adults are flightless, hard-shelled beetles, with long, downward curved mouthparts and elbowed antennae, moderately sized (smaller than Black Vine weevils), and about 3/8” long with reddish legs.
Adults start to emerge from the soil in early spring and most have emerged by mid-June. Adults climb canes at night to feed on buds and new laterals. Because they are flightless, they spread relatively slowly in a raspberry field. Eggs are laid by mid-July and hatch into grubs that feed on roots through summer. There is one generation per year.