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MONITORING POPULATION LEVELS OF EIGHT SPECIES OF NOCTUIDS WITH SEX-ATTRACTANT TRAPS IN SOUTHERN ALBERTA, 1978–1983: SPECIFICITY OF ATTRACTANTS AND EFFECT OF TARGET SPECIES ABUNDANCE

  • J.R. Byers (a1) and D.L. Struble (a1)

Abstract

The abundances of eight species of cutworm and armyworm moths were monitored with sex-attractant traps at 81 locations in a 13 000-km2 area of southern Alberta from 1978 to 1983. The life history and economic status of each species is summarized and the monitoring methodology is described. The attractants for redbacked cutworm (Euxoa ochrogaster), darksided cutworm (Euxoa messoria), pale western cutworm (Agrotis orthogonia), and army cutworm (Euxoa auxiliaris) were highly specific and > 99% of the moths caught were of the target species. Specificity of the attractants for clover cutworm (Discestra trifolii) and Leucania commoides was also high, averaging 98.3 and 96.6%, respectively, over 6 years. The attractants for variegated cutworm (Peridroma soucia) and bertha armyworm (Mamestra configurata) were less specific but the proportion of target species exceeded 80% in those years when either species was relatively abundant. For those species that were monitored over a wide range of population levels, the apparent specificity of the attractant varied directly with the number of target species moths caught. The use of efficient attractants in combination with high-capacity nonsaturating traps is clearly of advantage in enhancing specificity.

L’abondance de huit espèces de ver-gris et de légionnaires adultes a été suivie de près au moyen de pièges sexuels à 81 endroits dans une zone de 13 000 km2 du sud de l’Alberta, de 1978 à 1983. Les auteurs résument le cycle biologique et la situation économique de chaque espèce et décrivent la méthodologie utilisée. Les attractifs sexuels pour le ver-gris à dos rouge (Euxoa ochrogaster), le ver-gris moissonneur (Euxoa messoria), le ver-gris orthogonal (Agrotis orthogonia) et la légionnaire grise (Euxoa auxiliaris) sont très spécifiques et plus de 99% des adultes comptent parmi les espèces visées. La spécificité des attractifs pour le ver-gris du trèfle (Discestra trifolii) et Leucania commoides est également élevée, atteignant en moyenne 98,3 et 96,9% respectivement pendant 6 ans. Pour le ver-gris panaché (Peridroma saucia) et la légionnaire bertha (Mamestra configurata), les attractifs sont moins spécifiques, mais la proportion d’espèces visées dépasse 80% pendant les années où l’une ou l’autre des espèces est relativement abondante. Pour les espèces étudiées sur un large éventail de densités de population, la spécificité apparente de l’attractif varie directement en fonction du nombre de papillons des espèces cibles capturés. L’utilisation d’attractifs efficients avec des pièges non saturants de forte capacité est définitivement avantageuse pour améliorer la spécificité.

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References

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MONITORING POPULATION LEVELS OF EIGHT SPECIES OF NOCTUIDS WITH SEX-ATTRACTANT TRAPS IN SOUTHERN ALBERTA, 1978–1983: SPECIFICITY OF ATTRACTANTS AND EFFECT OF TARGET SPECIES ABUNDANCE

  • J.R. Byers (a1) and D.L. Struble (a1)

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