Abstract
Three alfalfa fields were sampled for alfalfa weevil (AW), Hypera postica (Gyllenhal), larvae to determine if reducing the number of stems per sample or subsampling the field would significantly influence the estimation of larva populations as determined by the standard whole-field, 30-stem sampling method. Results indicated that estimates of mean AW populations using 6- or 12-stem samples taken from 100-or 2,500-m2 subunit areas were not significantly different from those of the standard 30-stem, whole-field method. Analysis of variance indicated that mean AW population estimates of the 6- and 12-stem samples were not significantly different; nor were mean population estimates from the 100- and 2,500-m2 subunit sizes significantly different. However, less time was required to collect stems from a 100-m2 subunit using the 6-stem sampling method and to count larvae that were recovered from the 6-stem sample. Also, total effort required to estimate AW larva populations with a precision of 0.2 was least for the 6-stem, 100-m2 method.
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