Carrot weevil identification & organic control
Listronotus oregonensis
How to identify carrot weevil
A small, dark snout beetle whose legless larvae tunnel through carrot crowns and roots, most damaging in the Northeast and Midwest.
Crops attacked by carrot weevil
Carrot, Celery, Parsley.
Larvae tunnel into the crown and upper root, creating brown scars and channels that open the door to rot; adults feed lightly on foliage.
Life cycle
- Overwintering adult (Winter (in debris)) — None.
- Adults emerge (Spring) — Feed lightly; lay eggs in leaf petioles near the crown.
- Larva (3-4 weeks) — Crown and root tunneling; the destructive stage.
- New generation (Mid-late summer) — Second generation may attack fall carrots.
Natural, organic carrot weevil control
- 1. Rotate carrots away from prior beds · low effort
Move carrot and celery plantings at least 100 feet from last year's bed where practical.
When: Yearly planning
- 2. Row cover from seeding · medium effort
Prevents adult weevils from reaching the crop.
When: At seeding
Fastest-fix products
- Fine mesh row cover — Simple, effective exclusion for this weak-flying pest. · Garden centers, Amazon
Prevention
- Destroy carrot and celery tops right after harvest.
- Avoid successive plantings in the same bed within a season.