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DOUBLE-DEPTH SAMPLING FOR ALFALFA SNOUT BEETLE LARVAE, OTIORHYNCHUS LIGUSTICI (COLEOPTERA: CURCULIONIDAE)1

Published online by Cambridge University Press:  31 May 2012

William K. Mellors ,
Peter A. Follett  and
George G. Gyrisco
William K. Mellors
Affiliation:
Department of Entomology, Cornell University, Ithaca, New York 14853
Peter A. Follett
Affiliation:
Department of Entomology, Cornell University, Ithaca, New York 14853
George G. Gyrisco
Affiliation:
Department of Entomology, Cornell University, Ithaca, New York 14853
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Abstract

In the density sampling of Otiorhynchus ligustici (L.) in the soil, double-depth sampling provided equally precise estimates at lower total costs than conventional sampling in which all sampling units are processed to the same depth.

In five test plots, double-depth sampling with 30 cm first sample depths and 60 cm second depths appeared the most efficient for estimating the number of O. ligustici larvae per 30 cm. These samplings average 72% of the total cost of conventional single-depth sampling.

Résumé

Lors d'échantillonnages devant permettre d'estimer la densité d'Otiorhynchus ligustici (L.) au sol, des plans d'échantillonnage à deux profondeurs ont permis d'obtenir des estimés à coût plus bas que les plans d'échantillonnage habituels où toutes les unités d'échantillonnage sont prises à la même profondeur.

Dans cinq parcelles d'essais, des plans d'échantillonnage à deux profondeurs, dont la profondeur du premier échantillon était de 30 cm et celle du second de 60 cm, se sont avérés les plus efficaces pour l'estimation du nombre de larves d'O. ligustici par 30 cm. Ces plans reviennent à 72% du coût total des plans habituels d'échantillonnage à une seule profondeur.

Type
Articles
Information
The Canadian Entomologist , Volume 114 , Issue 12 , December 1982 , pp. 1171 - 1174
Copyright
Copyright © Entomological Society of Canada 1982

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References

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