Skip to page content
USDA Forest Service

Research & Development Treesearch

Treesearch Home
About Treesearch
Contact Us
Research & Development
Forest Products Lab
International Institute of Tropical Forestry
Pacific Northwest
Pacific Southwest
Rocky Mountain
Southern Research Station
Help - We Participate  Government Made Easy

Global Forest Information Service

US Forest Service
P.O. Box 96090
Washington, D.C.

(202) 205-8333

You are here: Home / Search / Publication Information
Bookmark and Share

Publication Information

View PDF (1.6 MB)

Title: Response of Spruce Budworm (Lepidoptera: Tortricidae) Infected with Nosema fumiferanae (Microsporida) to Bacillus thuringiensis Treatments

Author: Bauer, Leah S.; Nordin, Gerald L.;

Date: 1989

Source: Environmental Entomology. Vol. 18. no. 5.:p. 816-821.

Publication Series: Scientific Journal (JRNL)

Description: Diease 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.

Keywords: Insecta, Choriistoneura fumiferana, Nosema fumiferanae, Bacillus thuringiensis

Publication Notes:

  • 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.
  • This publication may be available in hard copy. 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, if you notice any errors which make this publication unusable.



Bauer, 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.


 [ Get Acrobat ]  Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility

USDA logo which links to the department's national site. Forest Service logo which links to the agency's national site.