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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

J. C. Guppy  and
D. G. Harcourt
J. C. Guppy
Affiliation:
Ottawa Research Station, Agriculture Canada, Ottawa
D. G. Harcourt
Affiliation:
Ottawa Research Station, Agriculture Canada, Ottawa
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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.

Type
Articles
Information
The Canadian Entomologist , Volume 109 , Issue 4 , April 1977 , pp. 497 - 501
Copyright
Copyright © Entomological Society of Canada 1977

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