Sorghum Midge
Contarinia sorghicola
📖 Description
Sorghum Midge is the most destructive pest of grain sorghum across the Indian subcontinent, particularly in Maharashtra, Karnataka, Andhra Pradesh, Tamil Nadu, and Madhya Pradesh. Adult female midges are tiny fragile orange-red flies that lay eggs inside sorghum spikelets at flowering. Newly hatched larvae feed on the developing ovary, preventing grain formation. Damaged spikelets become empty and chaffy, giving panicles a blasted appearance. A single larva can destroy one spikelet, and a single female can lay 50-100 eggs across many spikelets — meaning even small adult populations can cause heavy damage during the brief 7-10 day flowering period. The most effective management strategy is early, uniform planting to synchronize flowering and escape peak midge activity. Resistant varieties with long glumes that cover the ovary and prevent oviposition are also valuable.
⚠️ Symptoms to watch for
- Empty and shriveled spikelets, panicles with empty and chaffy grains, no grain formation in heavily infested panicles, yield loss 30-80%, complete crop loss in severe infestation
🩹 Treatment
- Plant early to escape peak midge activity, use resistant varieties, apply systemic insecticides at panicle emergence, set up sticky traps for adult monitoring, destroy wild sorghum hosts
🌿 Organic treatments
- Plant early to escape peak midge activity (single most effective control), use resistant varieties (with long glumes covering the ovary), destroy wild sorghum hosts (Johnson grass) around fields, apply neem oil 5 ml/L at panicle emergence, plant uniformly in an area to synchronize flowering, harvest promptly at maturity
🧪 Chemical treatments
- Spray Lambda-cyhalothrin 5 EC @ 1 ml/L at 50% panicle emergence, Endosulfan 35 EC @ 1.5 ml/L (where registered), Dimethoate 30 EC @ 1.5 ml/L, Imidacloprid 17.8 SL @ 0.3 ml/L, Bifenthrin 10 EC @ 1 ml/L (apply at panicle emergence before egg-laying)
🛡️ Prevention
- Plant early (within 7-10 days of monsoon onset) to escape peak midge activity, plant uniformly in an area to synchronize flowering, use resistant varieties with long glumes covering the ovary, destroy wild sorghum hosts (Johnson grass) around fields, balanced fertilizer use, harvest promptly at maturity, rotate with non-host crops, monitor panicles daily during flowering for adult midges
🪴 Affected plants
- Sorghum (all cultivated and wild species), Johnson Grass, Some Wild Sorghum
🦋 Natural predators
- Predatory Mites, Spiders, Predatory Thrips, Predatory Bugs
🌱 Host plants
- Sorghum bicolor, Sorghum halepense (Johnson grass)
🔄 Lifecycle
- Female lays 50-100 eggs inside sorghum spikelets at flowering.
- Eggs hatch in 2-4 days.
- Larvae feed on the developing ovary for 9-14 days, passing through 3 instars.
- Larvae enter diapause inside spikelets or in soil at the end of the season, lasting 6-12 months.
- Pupation occurs inside the spikelet, lasting 3-5 days.
- Adults live 1-2 days.
- Total life cycle 14-23 days (non-diapause); 1-5 generations per year depending on host availability.
📅 Season
- Active Aug-Nov during Kharif sorghum flowering, peaks 50% panicle emergence to grain formation
🔎 Appearance
- Tiny, fragile, orange-red mosquito-like flies with long legs and antennae.
- Adults are weak fliers.
- Larvae (maggots) are tiny orange maggots found inside sorghum spikelets, feeding on developing ovaries.
💥 Damage level
- High
🔁 Reproduction rate
- Fast
🗺️ Geographic regions
- Indian Subcontinent
- Africa
- Americas
- Australia
- Worldwide Sorghum-Growing Regions
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