Pest identification and confirmation—Other weevil species
At least half a dozen species of weevils occur in landscapes in Pacific Coast states, among them, the
Fuller rose beetle (Asynonychus godmani). Fuller rose beetle adults are sturdy, brown, flightless
snout beetles with bulging eyes. Larvae are yellow and oblong. Adults feed on foliage or blossoms, not
on roots.
Other weevils include the obscure root weevil (Sciopithes obscurus), the woods weevil
(Nemocestes incomptus), and Otiorhynchus spp., primarily the black vine weevil (O.
sulcatus), the cribrate weevil (O. cribricollis ), and the strawberry root weevil (O. ovatus). Larvae of several of these feed
on roots or bark around the crown.
Another weevil, the Douglas-fir twig weevil, Cylindrocopturus furnissi, is a small grayish
black species that attacks only Douglas fir. Adults chew twigs and lay eggs that hatch into twig-mining
larvae. Infested twigs turn brown and die. Weevils prefer to attack, and can kill, young drought-stressed
trees. Provide appropriate irrigation. During fall through spring, prune out and destroy infested limbs.
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Fuller
rose beetle adult
Fuller
rose beetle damage
Cribrate weevil adult
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