Otiorhynchus (= Brachyrhinus) sulcatus (Curculionidae)
the black vine weevil
||Root weevils can be recognized by their short snouts, stout
swollen bodies (Otiorhynchus looks almost 'inflated'), elongate elbowed
antennae and enlarged femur on all legs. All are parthenogenic. 8-11 mm in
length. Adults can live for three or more years and lay eggs each spring.
||Legless, curved larvae are white to pinkish in colour, and
have brown heads. The mandibles are short. The body segments appear somewhat
wrinkled and hairy. Half-grown larvae overwinter in the soil.
||Both the adult and larval stages are damaging to seedlings.
The adult weevils live above ground feeding on cotyledons and on the bark
of seedlings at night. Root weevil larvae are subterranean, feeding on the
roots of many kinds of plants including conifer seedlings in nursery beds.
Generally this insect attacks various broad-leaved plants such as berries
and rhododendrons. However, coniferous seedlings can also be utilized as
This insect can cause very significant damage in a forest nursery situation.
Rhododendrons are a favourite food of these weevils. Rhododendrons around
a nursery can give valuable indication of damage levels by these insects.
References and Links:
EAG: 549-553; FC: 329.
See Diseases and Insects in British Columbia Forest Seedling Nurseries.
Fact sheet: (Pennsylvania)
Fact sheet (Seattle)