Why does a person breed in special laboratories small insects from the order of Hymenoptera – ovaries and parasites?

1) These predatory insects lay their eggs in the eggs and larvae of insect pests.
2) By doing this, they reduce the number of insects – agricultural pests.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.