Effect of nonessential amino acids on phagostimulation and maintenance of the pea aphid, Acyrthosiphon pisum

Abstract
Eleven nonessential amino acids and amides, at concentrations ranging from 0.001-1.0% in 35% sucrose solutions, were individually tested for their role in phagostimulation, growth and survival in A. pisum (Harris). Alanine and .gamma.-amino butyric acid were generally phagostimulatory; asparagine, aspartic acid, cysteine, cystine, glutamic acid, glycine, proline, serine and tyrosine were generally inhibitory. Asparagine, glutamic acid, glycine and proline supported growth and prolonged survival; aspartic acid and tyrosine increased weight but did not prolong survival; alanine, .gamma.-amino butyric acid, cysteine and serine neither promoted growth nor prolonged survival.

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