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THE EFFECTS OF BENOMYL ON THE INCIDENCE OF MICROSPORIDIA AND THE DEVELOPMENTAL PERFORMANCE OF EASTERN SPRUCE BUDWORM (LEPIDOPTERA: TORTRICIDAE)

Published online by Cambridge University Press:  31 May 2012

G. T. Harvey  and
P. M. Gaudet
G. T. Harvey
Affiliation:
Great Lakes Forest Research Centre, Canadian Forestry Service, Sault Ste. Marie, Ontario
P. M. Gaudet
Affiliation:
Great Lakes Forest Research Centre, Canadian Forestry Service, Sault Ste. Marie, Ontario
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Abstract

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Benomyl or MBC phosphate incorporated into the meridic diet of eastern spruce budworm, Choristoneura fumiferana (Clem.), reduces the incidence of infection of adults by the microsporidian Nosema fumiferanae (Thom.). Some reduction in microsporidian levels is produced by 25 ppm benomyl; higher concentrations are more effective but even 250 ppm failed to reduce the incidence of microsporidia below 29% in a heavily infected stock. At benomyl concentrations of 75 ppm and above, budworm growth and fertility were reduced. The most notable effect of benomyl was the reduction of fertile matings and of percentage eclosion of eggs. Males were more sensitive to benomyl than females.

Résumé

En incorporant du bénomyl ou du phosphate MBC à la diète méridique de la Tordeuse des bourgeons de l’Épinette, Choristoneura fumiferana (Clem.) on réduit les cas d’infection des adultes par l’agent microsporidien Nosema fumiferanae (Thom.). Avec 25 ppm de bénomyl, on réduit quelque peu les niveaux de microsporidies; de plus fortes concentrations sont plus efficaces mais même avec 250 ppm, on n’a pu pas réduire les microsporidies au-dessous de 29% chez une colonie fortement infectée. Avec des concentrations de bénomyl à 75 ppm, la croissance et la fertilité de la Tordeuse furent diminuées. L’effet le plus remarquable du bénomyl fut la réduction des accouplements productifs et du pourcentage d’éclosion des oeufs. Les mâles furent plus vulnérables au bénomyl que les femelles.

Type
Articles
Information
The Canadian Entomologist , Volume 109 , Issue 7 , July 1977 , pp. 987 - 993
Copyright
Copyright © Entomological Society of Canada 1977

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