A complex predator population inside a good fly-tight house—coupled with careful manure and water management—can control flies in high-rise poultry houses.

For assistance and cooperation in helping to conduct vorious aspects of this study, the authors wish to credit the following: S. Isle, L. Youngs, J. Suh, M. Axtman, G. Kinnicutt, and D. Spence, Laboratory Assistants, Cooperative Extension, U.C. Davis, and the poultrymen and staff of the six ranches included in this survey.