In Nature, some of the vegetable-feeding species of insects have such enormous powers of multiplication, that, had it not been for the existence of certain natural checks-biological or climatic- no vegetation whatever will be left on the face of the earth. In the keen struggle for existence, certain insects that live at the expense of others usually exploit the presence of the vegetable feeders in such large numbers and are able to bring about a diminution in their numbers automatically. An attempt is made in this article to give an account of the natural enemies of some of the chief crop pests of the Northern Circars so as to show how they bring about their control.
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Tamil Nadu Agricultural University
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Tamil Nadu, India.
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