Culex tarsalis: Sequential Sampling as a Means of Estimating Populations in California Rice Fields1

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Abstract
Data from 5 sampling cycles on 16 rice fields in Fresno County, California, were fit to a series of negative binomial distributions with common k = 0.096. Although k increased significantly with higher counts, the increase was not sufficient to cause any important difference in sequential sampling plans from those based on the overall value. Lower elevations produced markedly higher capture rates both between and within paddies but this was not consistent for all fields. Thus, it is important to sample at various elevations within a field before accepting or rejecting mosquito control treatment. We present 3 alternative strategies for which treatment decisions are based on accumulating the larvae and pupae found in a given field, one sample at a time, until the total falls above or below prescribed limits.

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