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Studies on Free Amino Acids in the Spotted Alfalfa Aphid, Its Honeydew, and Several Alfalfa Selections, in Relation to Aphid Resistance¹

Synopsis: Several trends were revealed, possibly related to resistance. Large differences between the contents of ß-alanine and ethanolamine were found in aphids on resistant and susceptible alfalfa. Ethanolamine and pipecolic acid were identified as new constituents of alfalfa aphid honeydew. Environmental effects were significant.

² Associate Agriculturist, Research Assistant, (present address: Experiment Station, Hawaiian Sugar Planters Assn., Honolulu, Hawaii), Technician, IV, and Professor of Agronomy, respectively. University of California.

The authors extend thanks to E. H. Stanford, L. G. Jones, and W. Howe for supplying field plots and clones of alfalfa, to J. A. McMurtry for rearing aphids, and to J. E. Ruckman for valuable technical assistance.