Pea Aphid: Rearing on a Chemically Defined Diet.

Pea aphids, Acyrthosiphon pisum (Harr.), reared for two successive generations on a diet made of 23 amino acids and amides, 11 watersoluble vitamins, 35 percent sucrose, salts, and cholesterol, remained apterous. They grew and developed during the first generation almost as well as those grown on pea plants, with very little mortality.