Research on mosquito biology and ecology yields fundamental knowledge of the behavior, habits, breeding preferences, flight range, survival rates, and other characteristics of pest and disease-vector mosquitoes-information essential for effective planning and execution of control programs. Ecological studies assume greater importance in California than elsewhere because of the state's diverse climate and topography. Forty-nine mosquito species are found here, of which six are confirmed disease vectors.

Collaborative efforts of K. G. Whitesell, E. E. Kauffman, D. J. Womeldorf, and many individuals from the following agencies are acknowledged: Butle, Colusa, and Sutter-Yuba County Mosquito Abatement districts; Sutter-Yuba Bi-County Health Department; Vector Biology and Control Section, State Department of Health.