Carrot Rust Fly

Chamaepsila rosae

Content coming soon for this insect guide.

Insect Profile

Beneficial Rating

-5 Pest

Active Months

JanFebMarAprMayJunJulAugSepOctNovDec

US Distribution

NortheastMidwestPacific Northwest

Habitat Preferences

gardensagricultural fields

Taxonomic Group

Fly

Order

Diptera

Family

Psilidae

Lifecycle

The carrot rust fly overwinters as pupae in the soil or as larvae inside stored roots. In spring, from mid-April to June, the first generation of adult flies emerges. The females lay their eggs in the soil near the crown of a suitable host plant. After hatching, the larvae burrow into the soil to feed on the plant's roots for several weeks before pupating in the soil. A second generation of adults emerges from August to September, and in some regions, a third generation may follow, with adults active into October. The entire life cycle can have one to three generations per year depending on the climate.

Overwintering Strategy

Overwinters as pupae in the soil near the previous year's host plants, or as larvae within stored roots.

Native Range

Europe

Attracted By

carrotsparsnipsceleryceleriacparsleychervil

Repelled By

onionsleekschivesgarlicrosemarysage

Organic Control Methods

Organic control methods for the carrot rust fly focus on preventing the adult flies from laying eggs and disrupting their life cycle. Floating row covers can be placed over crops as soon as they emerge to create a physical barrier. Yellow sticky traps can be used to monitor adult fly activity and help time the placement of row covers. Crop rotation is essential; avoid planting carrots or other host plants in the same location for at least one year. Delaying planting until after the first generation of flies has emerged (late May or early June) can also reduce infestations. At the end of the season, it is crucial to harvest all roots and remove crop debris to eliminate overwintering sites for pupae and larvae. Introducing beneficial nematodes, such as *Steinernema* spp., to the soil can help control the larval population.

Companion Planting

Planting strong-smelling companion plants like onions, leeks, chives, rosemary, and sage can help to mask the scent of carrots and deter the carrot rust fly from laying its eggs. Intercropping these plants throughout the carrot patch is an effective strategy.