Ladybugs help humans by keeping a check on pests that destroy crops. Ladybugs have a voracious appetite. They consume plant-eating insects such as aphids, spider mites and mealybugs and in doing so they help protect crops.
Ladybugs lay hundreds of eggs in the colonies of pests and when the eggs hatch, the larvae begin to feed on the pest insects. Farmers use ladybugs for biological pest management. This way, the bugs help reduce the use of harmful pesticides.
Praying mantises, green lacewings and dragonflies too help humans in a similar fashion. These insects eat moths, mosquitoes, roaches, flies and many other insects considered pests by humans.