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What is the ecological principle behind ...

What is the ecological principle behind the biological control method of managing with pest insects?

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Biological control method adopted in the management of agricultural pest insects is based on the principle of predation. In this, certain living organisms act as predators and help to regulate the pest insects which act as their prey e.g. control of mosquito larvae in the water bodies by Gambusia fish, and control of aphids by lady bird beetals.
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