Aphid Midges: Tiny Flyers That Devour Aphids by the Dozens

Aphid midges (Aphidoletes aphidimyza) are delicate, mosquito-like flies whose bright orange larvae are aphid-killing machines. Each larva can consume up to 65 aphids per day, and they target over 60 aphid species—often outperforming ladybugs and lacewings in dense infestations.

Life Cycle and Behavior

Adults (under 1/8 inch) hide under leaves by day and feed on aphid honeydew at night. Females lay 100–250 shiny orange eggs among aphid colonies. Larvae hatch in 2–3 days, inject paralyzing toxin into aphids’ leg joints, then suck out their contents. After 3–7 days of feeding, larvae drop to the soil, pupate just below the surface, and emerge as adults in ~10 days. Multiple generations occur per season.

Using Aphid Midges for Control

They often arrive naturally when aphids appear. If not, purchase pupae from biological supply companies. Scatter pupae on moist, shaded soil near infestations. Release 2–4 batches over the season for severe outbreaks. Avoid insecticides; provide flowering plants for adult nectar. A single early release can establish a self-sustaining population.

Aphid midges are a cornerstone of integrated pest management for greenhouses and gardens—tiny, specialized, and remarkably effective.