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Vegetable weevil

Vegetable weevil, Listroderes difficilis, adult with prominent snout and V-shaped mark on back
Adult vegetable weevil.
Photo: Canola ute guide
Vegetable weevil, Listroderes difficilis, larva showing curved body
Larva. Photo: D Ironside
Scientific name

Listroderes difficilis


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.

Similar species

Whitefringed weevil, sitona weevil.


Originated in South America, now in North America, South Africa, east Asia, New Zealand and Australia.

Pest status

Minor, widespread, irregular.

Crops attacked

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.

Risk period

Seedling stage which may be attacked by adults and larvae.

Life cycle

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.

Action level

As indicated by leaf damage and seedling death.


Chemical control: Spraying damaged patches may be cost effective. For current chemical control options see Pest Genie or APVMA.

Cultural control: Alternate cropping with non-host plants or a long weed-free fallow prior to planting minimises numbers.

Further information

Last updated 03 September 2012