explain use of bio pest control
A similar question has already been answered.Follow the given link to view the same.
https://www.meritnation.com/ask-answer/question/what-rare-pests-how-can-plants-pests-be-controlled-in-wht/improvement-in-food-resources/3002834
https://www.meritnation.com/ask-answer/question/what-rare-pests-how-can-plants-pests-be-controlled-in-wht/improvement-in-food-resources/3002834