Indian Brown Lacewing

📖 Description

Indian Brown Lacewing (Micromus igorotus), also called Brown Aphid Lion, Indian Hemerobiid, or Himalayan Brown Lacewing, is an important beneficial predatory insect across the Indian subcontinent, found in diverse agroecosystems including cereals (wheat, rice, maize, sorghum), pulses (chickpea, pigeonpea, mungbean), vegetables (cabbage, cauliflower, tomato, brinjal, okra), fruit orchards (citrus, mango, apple), and medicinal plantations throughout mainland India, particularly common in temperate and subtropical regions (Himalayan foothills, Western Ghats, northeastern hills). The predator is unusual among Indian beneficial insects because (a) it is a specialist predator of aphids and other soft-bodied pests — particularly effective against Myzus persicae (peach-potato aphid), Aphis gossypii (cotton/melon aphid), Lipaphis erysimi (mustard aphid), Rhopalosiphum maidis (maize aphid), and Sitobion avenae (wheat aphid) — which are among the most destructive crop pests in Indian agriculture, (b) it also attacks mealybugs, mites (Tetranychus, Panonychus), soft scales (Coccus, Saissetia), whiteflies (Bemisia, Trialeurodes), and thrips — making it valuable across multiple cropping systems, (c) both larvae and adults are voracious predators — each larva consumes 100-300 aphids during its development, each adult consumes 30-80 aphids per week, with a single Micromus pair capable of producing offspring that consume over 5,000 aphids during their lifetime, (d) the predator uses an active hunting strategy — patrolling plant surfaces for aphid colonies, grabbing aphids with its sickle-shaped mandibles and sucking out body fluids; larvae also cover themselves with the carcasses of consumed prey (carried on the back as camouflage — diagnostic for some Hemerobiidae), (e) the predator has a relatively short life cycle (20-30 days from egg to adult; adult lifespan 30-45 days) — meaning each generation provides rapid pest control service, with multiple generations per year (8-12 overlapping generations), (f) the predator is distinct from the more familiar green Chrysoperla lacewings — brown lacewings (Hemerobiidae) are smaller, brownish, and have different habitat preferences (more common in shaded, humid habitats like orchards and forest edges — whereas Chrysoperla prefers open sunny habitats), making the two genera complementary in IPM programmes, (g) the adult brown lacewings are also predators (unlike adult Chrysoperla which feed only on nectar and pollen) — meaning both larvae and adults contribute to pest control, doubling the impact, (h) the predator is easy to mass-rear in the laboratory on factitious prey (Corcyra cephalonica eggs — rice moth, or laboratory-reared Aphis gossypii) — making augmentation biological control feasible, with ICAR-NBAIR (National Bureau of Agricultural Insect Resources, Bengaluru) and several Indian biocontrol companies producing Micromus for field release, and (i) the predator is particularly important in temperate and subtropical Indian agroecosystems (Himalayan foothills, Western Ghats, northeastern hills) — where it provides significant natural control of wheat aphids (Sitobion avenae, Rhopalosiphum padi — major wheat pests in northern India), apple aphids (Aphis pomi — major apple pest in Himachal Pradesh and J&K), and citrus aphids (Toxoptera, Aphis — major citrus pests in Coorg, Nagpur, Punjab). Conservation of this predator through habitat diversity (intercropping with flowering plants), reduced use of broad-spectrum insecticides, and provision of overwintering habitat (hedgerows, cover crops) is a cornerstone of sustainable IPM programmes. Augmentation biological control (release of lab-reared eggs or larvae @ 5,000-10,000/ha) can be effective in high-value crops like wheat, apple, citrus, and vegetables. The predator is a particular asset for Indian agriculture because (i) it provides significant natural control of wheat aphids (which cause over ₹1,500 crore per year in yield losses in northern India — wheat is India’s second most important food crop after rice), (ii) it is native to India and well-adapted to Indian temperate and subtropical agroecosystems, (iii) it is easy to mass-rear and release, and (iv) it complements the more familiar green Chrysoperla lacewings — together the two genera provide comprehensive aphid control across Indian agroecosystems.