This report describes a new set of standard fire behavior fuel models for use with Rothermel's surface fire spread model and the relationship of the new set to the original set of 13 fire behavior fuel models. To assist with transition to using the new fuel models, a fuel model selection guide,…
Keywords: fire behavior prediction, fire modeling, surface fuel, dynamic fuel model
Source: Gen. Tech. Rep. RMRS-GTR-153. Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station. 72 p.
In this report, we assess the unmitigated pest risk potential of importing Eucalyptus logs and chips from South America into the United States. To do this, we estimated the likelihood and consequences of introducing representative insects and pathogens of concern. Nineteen individual pest risk…
Keywords: Pest risk assessment, Eucalyptus, South America, log importation, chip importation
Source: Gen. Tech. Rep. FPL-GTR-124. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory. 134 p.
There is no scientific dispute regarding the existence of a greenhouse effect. There is no doubt that water vapor, carbon dioxide (CO2), and methane concentrations are greenhouse gases. The data showing increases in CO2 in the atmosphere are incontrovertible. Uncertainties arise when the Earth's…
Source: In: Gen. Tech. Rep. SRS–75. Asheville, NC: U.S. Department of Agriculture, Forest Service, Southern Research Station. Chapter 31. p. 365-371.
Oregon’s Land Use Planning Program is often cited as an exemplary approach to protecting forest and farm lands from development. In November 2004, Oregon voters approved a ballot measure—Measure 37—to require the state to compensate landowners for any property value losses resulting from land use…
Source: Res. Note PNW-RN-548. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 16 p
There is little question that global warming would increase the risk of wildfires by drying out vegetation and stirring the winds that spread fire. Until recently, however, land managers were unable to formulate appropriate responses because the spatial scales of predictions were far too coarse.…
Source: Science Findings 74. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 5 p
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…
Keywords: biological weed control, domestic geese, hexazinone, Picea glauca
Source: Ecological Applications. 5(3): 570-578.
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-…
Keywords: ectomycorrhizal fungi, sporocarp production, forest succession, Pseudotsuga menziesii, Tsuga heterophylla zone, biodiversity
Source: Canadian Journal of Botany. 80: 186-204
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.
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.
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).…
Keywords: intraspecific hybrids, polymerase chain reaction, resistance genes
Source: Phytopathology. 90: 1039-1042.
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…
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.