Skip to main content
U.S. flag

An official website of the United States government

3,514 results found
Vertebrate herbivores can be effective agents of biological weed control in certain applications. I compared the use of domestic geese for weed control in an agricultural field with the herbicide hexazinone and with hand control. Newly planted spruce seedlings acted as a prototype crop that would…
Author(s): Tricia L. Wurtz
Keywords: biological weed control, domestic geese, hexazinone, Picea glauca
Source: Ecological Applications. 5(3): 570-578.
Year: 1995
Knowledge of the community structure of ectomycorrhizal fungi among successional forest age-classes is critical for conserving fungal species diversity. Hypogeous and epigeous sporocarps were collected from three replicate stands in each of three forest age-classes (young, rotation-age, and old-…
Author(s): J.E. Smith, R. Molina, M.M.P. Huso, D.L. Luoma, D. McKay, M.A. Castellano, T. Lebel, Y. Valachovic
Keywords: ectomycorrhizal fungi, sporocarp production, forest succession, Pseudotsuga menziesii, Tsuga heterophylla zone, biodiversity
Source: Canadian Journal of Botany. 80: 186-204
Year: 2002
Color photographs show how white pine blister rust can be identified. In addition, the photographs show how pines resistant to the fungus could be identified. Such trees could be used to develop a new variety of whitebark pine that is resistant to blister rust.
Author(s): Ray J. Hoff
Keywords: disease resistance, Cronartium ribicola, Pinus albicaulis, plant diseases, fungal diseases
Source: Res. Note INT-406. Ogden, UT: U.S. Department of Agriculture, Forest Service, Intermountain Research Station. 8 p.
Year: 1992
In the north central United States, leaf rust caused by Melampsora medusae is a major disease problem on Populus deltoides. In this study we identified molecular markers linked to a M. medusae resistance locus (Lrd1) that was segregating 1:1 within an intraspecific P. deltoides family (C9425DD).…
Author(s): G. M. Tabor, Thomas L. Kubisiak, N. B. Klopfenstein, R. B. Hall, Henry S. McNabb
Keywords: intraspecific hybrids, polymerase chain reaction, resistance genes
Source: Phytopathology. 90: 1039-1042.
Year: 2000
Comandra blister rust is a damaging canker disease of lodgepole pine in the Central Rocky Mountains. Our knowledge of previous blister rust outbreaks and the effects of weather and climate on rust epidemiology has not been sufficient to explain the frequency and severity of disease outbreaks. Thus…
Author(s): William R. Jacobi, Brian W. Geils, Jane E. Taylor
Keywords: climate, weather, meteorology, risk rating, spore dispersal
Source: Res. Pap. RMRS-RP-36. Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station. 13 p.
Year: 2002
Information on the diet of the American marten (Martes americana) is vital to understanding habitat requirements of populations of this species. The frequency of occurrence of prey items found in 1014 scat samples associated with 31 radiocollared American martens in northeastern Oregon…
Author(s): E.L. Bull
Keywords: American marten, Martes americana, northeastern Oregon, small mammals, diet
Source: Northwest Science. 74(3): 186-191
Year: 2002
Understanding ecological processes and their spatial scales is key to managing ecosystems for biodiversity, especially for species associated with late-seral forest. We focused on 2 species of squirrel (Sciuridae: northern flying squirrel, Glaucomys sabrinus, and Townsend's chipmunk, Tamias…
Author(s): A.B. Carey, J. Kershner, B. Biswell, L.S. Dominguez de Toledo
Keywords: ecological scale, forest development, Glaucomys sabrinus, habitat, northern flying squirrel, Oregon, Tamias townsendii, Townsend's chipmunk
Source: Wildlife Monographs. 142: 1-71
Year: 1999
Of the 15 species of bats in the Pacific Northwest, 11 are known to make regular use of the forest canopy for roosting, foraging, and reproduction. This paper reviews roosting requirements, foraging, and the importance of landscape-scale factors to canopy using species in the Northwest. Many…
Author(s): L. Wunder, A.B. Carey
Source: Northwest Science. 68(2): 159
Year: 1994
For the past sixty years, ecologists have been arguing about what an ecosystem is, and the debate continues (Blew 1996; Lenz and Haber 1996). Ecosystem management, however, is an entirely human process that entails not only manipulating and protecting ecosystems but also making private and public…
Author(s): A.B. Carey
Source: In: Calhoun, J.M., ed. Forest policy: ready for renaissance. Seattle, WA : College of Forest Resources, University of Washington: 261-273
Year: 1998
The U.S. landscape has undergone substantial changes since Europeans first arrived. Many land use changes are attributable to human activity. Historical data concerning these changes are frequently limited and often difficult to develop. Modeling historical land use changes may be neccessary. We…
Author(s): David P. Coulson, Linda Joyce
Keywords: landscape, land use changes, human activity, modeling land use trends, linear interpolation
Source: Gen. Tech. Rep. RMRS-GTR-111. Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station. 55 p.
Year: 2003