Midge
Cecidomyiidae
📖 Description
The Cecidomyiidae family contains a diverse mix of both pest and beneficial species. Many gall midges cause distinctive swellings on plants by feeding within plant tissue, while others like the Hessian fly are serious agricultural pests of wheat and grasses. However, many cecidomyiid species are actually beneficial predators — the aphid midge (Aphidoletes aphidimyza) is one of the most important biological control agents for aphids. The family is one of the largest in the order Diptera, with over 6,000 described species worldwide. Proper identification is important to distinguish pest species from beneficial ones before taking control measures.
⚠️ Symptoms to watch for
- Galls or swellings on leaves, stems, or buds caused by larval feeding,Distorted or stunted new growth at feeding sites,Small orange or white larvae visible when galls are opened,Reduced vigor in heavily infested plants,Wheat heads with bleached or shriveled grains (Hessian fly)
🩹 Treatment
- Prune and destroy galled plant parts (organic),Release aphid midge (Aphidoletes aphidimyza) for aphid control (organic),Apply systemic insecticide to affected plants (chemical),Remove and destroy infested plant material (organic),Use insecticidal soap on affected foliage (organic)
🌿 Organic treatments
- Prune and destroy galled plant parts,Release aphid midge (Aphidoletes aphidimyza) for aphid control,Remove and destroy infested plant material,Use insecticidal soap on affected foliage
🧪 Chemical treatments
- Apply systemic insecticide to affected plants
🛡️ Prevention
- Inspect new plants for galls before purchasing,Prune out galled growth before midge populations build,Rotate crops to disrupt pest midge life cycles,Remove crop debris after harvest to eliminate overwintering sites,Use resistant plant varieties when available,Encourage beneficial midge species by planting nectar sources
🪴 Affected plants
- Various Plants,Wheat,Grasses
🦋 Natural predators
- Various beneficial insects
🌱 Host plants
- Various plants
🔄 Lifecycle
- Females lay eggs on or in plant tissue.
- Eggs hatch in 2-5 days.
- Larvae feed within plant tissue causing gall formation, or feed as predators on other insects.
- Larval development takes 1-3 weeks.
- Mature larvae drop to soil to pupate.
- Pupation takes 1-2 weeks.
- Adults are short-lived, living only 1-3 days.
- Multiple generations per year with 3-6 common in warm climates.
- Most species overwinter as larvae in soil or plant debris.
📅 Season
- Spring to Fall (varies by species)
🔎 Appearance
- Tiny, delicate flies resembling miniature mosquitoes with long antennae and slender bodies.
- Most species are too small to see clearly without magnification.
- Larvae are small, orange to white maggots found within plant galls or soil.
- Many species in this family are actually beneficial predators of other pests.
💥 Damage level
- Low
🔁 Reproduction rate
- Moderate
🗺️ Geographic regions
- North America
- Europe
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