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MONITORING POPULATION LEVELS OF EIGHT SPECIES OF NOCTUIDS WITH SEX-ATTRACTANT TRAPS IN SOUTHERN ALBERTA, 1978–1983: CONGRUENCY OF YEAR-TO-YEAR FLUCTUATIONS IN INTRASPECIFIC DENSITY SHOWN BY SUBSETS OF MONITORING SITES

Published online by Cambridge University Press:  31 May 2012

J.R. Byers ,
D.L. Struble  and
G.B. Schaalje
J.R. Byers
Affiliation:
Agriculture Canada Research Station, Lethbridge, Alberta, Canada T1J 4B1
D.L. Struble
Affiliation:
Agriculture Canada Research Station, Lethbridge, Alberta, Canada T1J 4B1
G.B. Schaalje
Affiliation:
Agriculture Canada Research Station, Lethbridge, Alberta, Canada T1J 4B1
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Abstract

The abundance levels of eight species of cutworms and army worms were monitored with sex-attractant traps at 81 locations in a 13 000-km2 area of southern Alberta from 1978 to 1983. Year-to-year change in population levels could be consistently detected by monitoring at a relatively small number of locations. For all species, subsets of selected locations along transects, or random subsets of as few as five locations, showed year-to-year fluctuations in mean catch per trap that were similar in pattern to those of the whole monitored area. The results indicate that long-term surveillance monitoring of pest species of cutworms and armyworms to detect year-to-year population changes, and long-term trends, is feasible in terms of both the resource requirements and reliability of the relative population estimates.

Résumé

De 1978 à 1983, on a surveillé les populations de huit espèces de vers-gris et de légionnaires à l’aide de pièges sexuels répartis en 81 points sur une superficie de 13 000 km2 dans le sud de l’Alberta. Il est possible de mesurer les variations de populations d’une année à l’autre en effectuant une surveillance en un nombre d’endroits relativement faible. Pour toutes les espèces, des sous-ensembles de points donnés long des transects ou des sous-ensembles aléatoires restreints (aussi peu que cinq endroits) ont affiché d’une année à l’autre des fluctuations du nombre moyen d’insectes par piège comparables à celles observées dans toute la région à l’étude. Il semble donc qu’une surveillance à long terme des espèces de vers-gris et de légionnaires dommageables aux cultures afin de déceler les fluctuations des populations d’une année à l’autre et les tendances à long terme soit faisable sur le plan tant des besoins en ressources que de la fiabilité des résultats obtenus.

Type
Articles
Information
The Canadian Entomologist , Volume 120 , Issue 12 , December 1988 , pp. 1071 - 1078
Copyright
Copyright © Entomological Society of Canada 1988

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