Accidental introduction of the oriental fruit fly—Dacus dorsalis Hendel—to the mainland as it was to the Hawaiian Islands is a distinct threat to California agriculture.

Harry S. Smith, Professor of Entomology, Emeritus, was Chairman, Biological Control, at the time the study reported here was made

The above progress report is based on Research Project No. 1411 organized and implemented by Harry S. Smith, Chairman of the Department of Biological Control

The study of adult fly nutrition was done by Kenneth S. Hagan, Junior Entomologist, University of California, Albany, California. The studies of larval nutrition and associated microorganisms were done by Shizuko Maeda, United States Department of Agriculture, Hawaii