Detrimental effects:

• Destruction or spoilage of food (both fresh and stored) and crops (including forests)
• Crop losses due to insect pests in Nepal is about 15-20 % (Neupane, 2058). ( In world 12.5%, Cramer, 1967)
• Damage to goods – leather, paper, textiles, (by beetles, cockroaches, silverfish or moths), timber (by termites and different types of borers).
• Transmits disease in plants and animals: Disease causing Mosquito-Malaria, Filariasis, and dengue fever. Housefly- Typhoid, Cholera, Leprosy, Anthrax
• Possess venoms and cause allergies
• Some insects are a nuisance to our well-being -house flies, ants, mosquitoes
• Cause phobias – fear of grisly caterpillars or spiders (arachnophobia)
• Require use of pesticides and other poisons, which often harm other animals