Skip to Main Content
Comparison of Bt formulations against the spruce budwormAuthor(s): Lew McCreery; Imants Millers; Dennis Souto; Bruce Francis
Source: In: Grimble, David G.; Lewis, Franklin B., coords. Proceedings, Symposium: Microbial control of spruce budworms and gypsy moths; 1984 April 10-12; Windsor Locks, CT. Gen. Tech. Rep. NE-100. Broomall, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. 23-27
Publication Series: General Technical Report (GTR)
Station: Northeastern Research Station
PDF: Download Publication (357.73 KB)
DescriptionThe Passamaquoddy Indian Forestry Department treated 40,300 acres in Maine in 1983 using Bt to protect red spruce and eastern hemlock from spruce budworm damage. The post treatment evaluation indicated that the protection objectives were achieved. In cooperation between the Passamaquoddy Indian Forestry Department and two commercial Bt suppliers, Abbott Laboratories and Zoecon Corporation, four commercial products were applied as eight field formulations. Where possible, these treatments were compared for effectiveness. The results show an average defoliation of 23 percent and population reduction from 864.5 budworms per 100 square feet of foliage to 62.5 budworms, or an average of 94 percent population reduction. The undiluted field formulations gave significantly (P = 0.05) less defoliation and greater population reduction than the diluted formulations. A method for spray deposit assessment using spruce foliage is presented.
- 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, firstname.lastname@example.org 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.
CitationMcCreery, Lew; Millers, Imants; Souto, Dennis; Francis, Bruce. 1985. Comparison of Bt formulations against the spruce budworm. In: Grimble, David G.; Lewis, Franklin B., coords. Proceedings, Symposium: Microbial control of spruce budworms and gypsy moths; 1984 April 10-12; Windsor Locks, CT. Gen. Tech. Rep. NE-100. Broomall, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. 23-27
- Decaying wood and tree regeneration in the Acadian Forest of Maine, USA
- The isolated red spruce communities of Virginia and West Virginia
- Protection of tree seedlings from deer browsing
XML: View XML