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POPULATION ASSESSMENT DURING THE ADULT STAGE OF THE ALFALFA WEEVIL, HYPERA POSTICA (COLEOPTERA: CURCULIONIDAE)1
Published online by Cambridge University Press: 31 May 2012
Abstract
This paper presents a sampling plan for estimating numbers of H. postica adults in alfalfa. The plan is based on vacuum samples of foliage and ground litter and uses a half ft2 (465 cm2) as the sample unit. For typical levels of infestation during the oviposition period in early spring, estimates with reasonable precision may be obtained by taking 60 randomly selected units from a field, at a total cost of 6 man-hours. For those in early summer, not more than 20 units are required.
For all population densities, the pattern of counts was well described by the negative binomial distribution. However, at densities below unity, the Poisson function described the data equally well.
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- Copyright © Entomological Society of Canada 1977
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