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AN ASSESSMENT OF THE IMPACT OF LARGE SCALE SPRAYING OPERATIONS ON THE REGIONAL DYNAMICS OF SPRUCE BUDWORM (LEPIDOPTERA: TORTRICIDAE) POPULATIONS

Published online by Cambridge University Press:  31 May 2012

R. A. Fleming ,
C. A. Shoemaker  and
J. R. Stedinger
R. A. Fleming
Affiliation:
Department of Environmental Engineering, Cornell University, Ithaca, New York 14853
C. A. Shoemaker
Affiliation:
Department of Environmental Engineering, Cornell University, Ithaca, New York 14853
J. R. Stedinger
Affiliation:
Department of Environmental Engineering, Cornell University, Ithaca, New York 14853
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Abstract

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Exploratory data analysis was employed to investigate the regional dynamics of managed budworm populations based upon survey data reporting spruce budworm egg-mass densities and damage to balsam fir. The Maine Forest Service collected these data annually from 1975 to 1980 at approximately 1000 different locations each year throughout Maine's spruce–fir forest regions. Although spraying was often associated with ‘better’ conditions in heavily defoliated or infested areas, it was generally associated with somewhat ‘poorer’ conditions in areas which had experienced only light defoliation or infestation in the previous year. The analysis also indicated that while insecticide application may reduce budworm larval populations immediately after application, the largest relative decrease in defoliation rates appeared the year after insecticide application. Insecticide treatments were not as effective as expected. In the year following application, the maximum reduction observed in average defoliation was 20% and in average egg-mass density the maximum reduction was 50%. In many cases the reduction was substantially less. Spraying was not associated with any substantial decline in hazard rating.

Résumé

Une analyse exploratoire de données a été effectuée afin d'étudier la dynamique régionale de populations de la tordeuse ayant fait l'objet de programmes de lutte, d'après les données des réseaux de surveillance des densités de masses d'oeufs et des dommages causés au sapin baumier. Le Service des Forêts du Maine a recueilli ces données annuellement de 1975 à 1980 dans environ 1000 localités différentes dispersées partout dans les boisés d'épinette et de sapin du Maine. Bien que les arrosages aient souvent été corrélés à une amélioration de la situation dans les régions fortement défoliées ou infestées, ils étaient corrélés à une certaine détérioration des conditions dans les régions qui avaient subi une défoliaison légère ou qui avaient été infestées l'année précédente. L'analyse a aussi indiqué que malgré que l'application d'insecticide puisse réduire les populations larvaires de tordeuse dans l'immédiat, les diminutions relatives les plus importantes du taux de défoliaison se produisent l'année suivant l'application. Les traitements insecticides n'ont pas été aussi efficaces qu'espéré. L'année suivant l'application, la réducion maximale observée de la défoliaison moyenne était de 20%, et celle de la densité moyenne des masses d'oeufs était de 50%. Dans plusieurs cas la réduciton était substantiellement moindre. Les arrosages n'ont pu être corrélés à aucune baisse substantielle du niveau d'alerte.

Type
Articles
Information
The Canadian Entomologist , Volume 116 , Issue 4 , April 1984 , pp. 633 - 644
Copyright
Copyright © Entomological Society of Canada 1984

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