Abstract
The sampling distribution of wheat midge Sitodiplosis mosellana (Géhin) cocoons, soil-dwelling larvae and pupae, were determined using Taylor's power law. The regressions of the Taylor power law mean–variance relationships were highly significant ( P<0.001) with slopes significantly greater than unity ( P<0.01) for all stages, indicating aggregation. A sequential estimation plan with fixed precision (ratio of the standard error of the mean to the mean) level was developed for population estimation of cocoons, larvae and pupae in the soil, and validated using a re-sampling method. The cocoon stage was most reliable for estimating population density and damage potential for IPM purposes.
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