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Response of Spruce Budworm (Lepidoptera: Tortricidae) Infected with Nosema fumiferanae (Microsporida) to Bacillus thuringiensis TreatmentsAuthor(s): Leah S. Bauer; Gerald L. Nordin
Source: Environmental Entomology. Vol. 18. no. 5.:p. 816-821.
Publication Series: Scientific Journal (JRNL)
Station: North Central Research Station
PDF: Download Publication (1.6 MB)
DescriptionDiease in spruce budworm, Choristoneura fumiferana (Clemens), caused by the microsporidian Nosema fumiferanae (Thomson), increase larval susceptibility to mortality by bacillus thuringlensis (Berliner) treatments compared with larvae free of N. fumiferanae disease. The median lethal concentration (LC50) of B. thuringiensis as determined by the diet incorporation bioassay method, was significantly lower for larvae infected transoverially with N. fumiferanae, but the similar slope obtained for intitially healthy larvae indicated an independent and additive interaction. The median lethal time (LT50) for B. thuringiensis was shortest for the group diseased with N. fumiferanae. Results from seperate and sequential oral treatments (horizontal transmission) of both microorganisms at fixed physiological stages support the finding from the transovarial studies. It also was determined that N. fumiferanae-free larvae surviving B. thuringiensis treatment were more susceptible to mortality from subsequent inoculations with N. fumiferanae than were larvae not previously exposed to B. thuringiensis.
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CitationBauer, Leah S.; Nordin, Gerald L. 1989. Response of Spruce Budworm (Lepidoptera: Tortricidae) Infected with Nosema fumiferanae (Microsporida) to Bacillus thuringiensis Treatments. Environmental Entomology. Vol. 18. no. 5.:p. 816-821.
KeywordsInsecta, Choriistoneura fumiferana, Nosema fumiferanae, Bacillus thuringiensis, spruce budworm
- Response of Spruce Budworm (Lepidoptera: Tortricidae) Infected with Nosema fumiferanae (Microsporida) to Bacillus thuringiensis Treatments
- Pathogenicity Of Nosema fumiferanae (Thomson) (Microsporida) In Spruce Budworm, Choristoneura Fumiferana (Clemens), And Implications Of Diapause Conditions
- Nutritional pyhsiology of the eastern spruce budworm, Choristoneura fumiferana, infected with Nosema fumiferanae, and interactions with dietary nitrogen
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