Skip to Main Content
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: View PDF (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 bioassy 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.
- Check the Northern Research Station web site to request a printed copy of this publication.
- Our on-line publications are scanned and captured using Adobe Acrobat.
- During the capture process some typographical errors may occur.
- Please contact Sharon Hobrla, email@example.com if you notice any errors which make this publication unusable.
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
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
- 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
XML: View XML