- Adult vegetable weevil.
Photo: Canola ute guide
- Larva. Photo: D Ironside
Larvae are up to 12 mm long, yellow-green or cream with an orange-brown head, legless and have a curved body. Adults are 8 mm long, are greyish-brown with a V-shaped pale mark near the middle of the back and have a prominent snout. Vegetable weevils are flightless.
Originated in South America, now in North America, South Africa, east Asia, New Zealand and Australia.
Minor, widespread, irregular.
Canola, most vegetables, including brassicas and a wide range of weeds.
Larvae and adults chew sections out of the leaves of seedlings, usually in the evening and night. Seedlings may be retarded or killed by feeding.
Seedling stage which may be attacked by adults and larvae.
One generation per year. Adult females are capable of laying several hundred eggs. Eggs laid in the surface litter of the soil in autumn hatch into larvae that feed during the night on developing plants and shelter in the soil during the day. The fully grown larvae pupate in cells in the soil in early spring. Adults emerge in spring, feed at night and shelter during the day. During summer, the adults remain inactive in the soil.
Check seedling crops in the evening for the presence of larvae or adults.
As indicated by leaf damage and seedling death.
Cultural control: Alternate cropping with non-host plants or a long weed-free fallow prior to planting minimises numbers.
- Pests of field crops and pastures: identification and control, editor P T Bailey.