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EFFICIENT MONITORING OF THE DENSITY OF ADULT NORTHERN CORN ROOTWORM (COLEOPTERA: CHRYSOMELIDAE) IN HELD CORN

Published online by Cambridge University Press:  31 May 2012

Alan J. Sawyer
Affiliation:
Department of Entomology, Cornell University, Ithaca, New York 14853

Abstract

Sampling statistics for adult northern corn rootworms in New York field corn are reported, with particular reference to efficient monitoring for decision-making in pest management. The most efficient sample unit of those examined was a single, entire plant. Sample sizes and associated costs required to achieve fixed levels of precision for estimates of density are reported. Because required sample sizes are density dependent, a sequential-sampling plan providing final estimates of density at preset levels of precision is developed. The method makes no assumption about the frequency distribution of insect counts, which was found to vary from field to field and with time. Disturbance caused by sampling activity may introduce a bias of unknown direction and magnitude in estimates of beetle density. Care in approaching and examining plants; should reduce this bias.

Résumé

On présente des statistiques d'échantillonnage pour les adultes de la chrysomèle du maïs dans le maïs fourrage, en particulier en ce qui concerne l'efficacité de la surveillance pour la prise des décisions en lutte intégrée. L'unité d'échantillonnage la plus efficace parmi celles qui ont été examinées est un seul plant entier. On mentionne les tailles d'échantillon nécessaires à l'obtention de niveaux donnés de précision, de même que les coûts correspondants. Puisque les tailles d'échantillons requises sont dépendantes de la densité, on a développé un plan d'échantillonnage séquentiel permettant d'obtenir des estimés finals de la densité à des niveaux donnés de précision. La méthode ne requiert pas de suppositions quant à la distribution de fréquence des décomptes d'insectes, laquelle variait d'un champ à l'autre et en fonction du temps. Les perturbations dûes à l'échantillonnage peuvent fausser de façon imprévisible les estimés de la densité de la chrysomèle. Il est recommandé d'approcher et d'examiner les plants avec prudence de façon à éviter ce biais.

Type
Articles
Copyright
Copyright © Entomological Society of Canada 1985

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