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Can. Ent. 98: 1121-1134 (1966) The role that nutrition plays in biological control may be seen in natural environments; but t o understand and to make use of this role the principles concerned must be understood essentially in tcrms of specific chemical substances.A number of principles of insect nutrition particularly relevant t o hiologica1 control concern the food of the host, the host itself, and in p;trasitoid. These principles may be generalized into three Ila\vs and they are called herc the rille of sameness, the principle of nutrient proport ionalinr, and the principle of cooperating supplements. Each is discussed in connection with its application in the laboratory or in natural environments, and a few examples of wtak relaring to each are given.Most examples quoted are from work at Belleville, Ontario, on thc parasitoid Pseudosarcoph.aga afinis Auct. nec. Fallkn.

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