Carrot Weevil

How to prevent or control carrot weevils

January 24, 2013

Listronotus oregonensis

Adults: coppery brown, hard-shelled, 1/6-inch weevils. Larvae: white, legless, C-shaped, 1/3-inch grubs with brown heads. Found in New England and eastern United States.


Related: How To Plant Carrots

Larvae tunnel through stems and roots of carrot family plants, stunting or killing plants. Infested carrot roots and celery stalks may be unfit to harvest.

Life Cycle
Overwintering adults emerge from grass or garden litter in mid- to late spring, lay eggs on plant stems; larvae bore into stems and downward into roots, then pupate in soil by late spring, early summer. Second-generation adults emerge in midsummer.

Weevils do not fly, so plant susceptible crops in uninfested areas and for additional protection, cover the seedbeds with floating row cover. Drench infested soil with parasitic nematodes.

Photos: Whitney Cranshaw, Colorado State University,