📋 In This Article
Insects make up over 70% of animal species on Earth and perform ecological services — pollination, decomposition, pest control, and as food for other animals — that underpin all terrestrial ecosystems. A global insect decline of 40–60% is now well-documented, with profound consequences for food security and ecological stability.
The Scale of Insect Decline
Studies from Europe show 75% reduction in flying insect biomass over 27 years. Similar trends are documented globally. In India, monitoring data is limited, but evidence from agricultural landscapes, reduced firefly sightings, declining bee populations, and changes in bird behaviour that feeds on insects all point to significant declines.
Why Insects Are Essential
Bees, butterflies, and flies pollinate 75% of food crops and 90% of flowering plants. Without pollinators, India's mango, coconut, cardamom, and hundreds of other crops would fail or yield dramatically less. Decomposer insects (beetles, flies, ants) break down organic matter and recycle nutrients — without them, dead matter accumulates and nutrient cycling slows.
- Bees — pollinate 75%+ of food crops
- Dung beetles — recycle animal waste, improving soil
- Ladybirds — natural pest control, reducing crop damage
- Fireflies — indicator of healthy wetlands
- Ants — soil aeration, seed dispersal
- Caterpillars — critical food for nesting birds
Causes of Insect Decline in India
Pesticide use is the primary driver — neonicotinoid insecticides are particularly devastating to bees. Habitat loss (elimination of flowering wildflowers in agriculture) removes food for pollinators. Light pollution disrupts moth and firefly reproduction. Urban expansion replaces insect habitat with concrete and manicured lawns. Climate change shifts flowering times out of sync with pollinator cycles.
What Can Be Done
Plant native flowering plants in gardens — even a 10 sq ft wildflower patch provides significant pollinator habitat. Reduce or eliminate pesticide use at home and in gardens. Install native bee hotels. Leave leaf litter and log piles as overwintering habitat. Support organic farming. Advocate for pesticide regulation, particularly of neonicotinoids.
Conclusion
Insects are the biological infrastructure upon which most of life on Earth depends. Their decline is not just a conservation concern — it is a food security emergency. Every garden planted with native flowers, every pesticide avoided, directly helps.