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Creator:: Kegley, Sandy, United States. Forest Service. Northern Region, and United States. Forest Health Protection
Resource Type:: Technical Report

Creator:: Kegley, Sandy, United States. Forest Health Protection, and United States. Forest Service. Northern Region
Abstract:: Whitebark pine, Pinus albicaulis Engelm. is an important but declining high-elevation tree species in western forests. Regeneration of this species has been difficult and the impact of cone and seed insects unknown. Seven sites selected from the geographical range of whitebark pine in Idaho, Montana, Washington, Oregon, and California were...
Resource Type:: Technical Report

Creator:: Kegley, Sandy, Schwandt, John W., Gibson, Kenneth E., United States. Forest Health Protection, and United States. Forest Service. Northern Region
Resource Type:: Technical Report

Creator:: James, Robert L., United States. Forest Health Protection, and United States. Forest Service. Northern Region
Abstract:: Tests were conducted at the USDA Forest Service Nursery, Coeur d'Alene, Idaho to evaluate effectiveness of spring fumigation with dazomet to improve survival and performance of Douglas-fir and western white pine transplants. Spring fumigation greatly reduced populations of potentially pathogenic Fusarium and Pythium spp. Disease levels of container (plug+1) and...
Resource Type:: Technical Report

Creator:: James, Robert L., United States. Forest Health Protection, and United States. Forest Service. Northern Region
Abstract:: Soil in Field 2 at the USDA Forest Service Nursery, Coeur d'Alene, Idaho was assayed six times over a 2-year fallow period for potentially pathogenic Fusarium and Pythium spp. following incorporation of a corn cover/green manure crop. Populations of potentially disease-antagonistic Trichoderma spp. were also assayed. Soil populations of Fusarium...
Resource Type:: Technical Report

Creator:: James, Robert L., United States. Forest Health Protection, and United States. Forest Service. Northern Region
Abstract:: Thirty-three isolates of Fusarium acuminatum obtained from inland Pacific Northwest forest nurseries were tested for their pathogenicity on young Douglas-fir germinants under controlled laboratory conditions. Tested isolates were from forest nursery soil, roots of healthy-appearing and diseased conifer seedlings, Styrofoam and hard plastic containers, conifer seeds, 411 and adult fungus...
Resource Type:: Technical Report

Creator:: James, Robert L., Perez, R., United States. Forest Health Protection, and United States. Forest Service. Northern Region
Abstract:: Forty-seven isolates of Fusarium solani obtained from the roots of diseased and healthy conifer seedlings and forest nursery soil were tested for pathogenicity on young Douglas-fir germinants under controlled laboratory conditions. Isolate virulence varied widely; a few were highly virulent whereas many were classified as non-pathogenic. Isolates from the roots...
Resource Type:: Technical Report

Creator:: James, Robert L., United States. Forest Health Protection, and United States. Forest Service. Northern Region
Abstract:: Investigations were conducted from 1998- 2000 at the Potlatch Corporation's Cherrylane Seed Orchard near Lewiston, Idaho to evaluate presence and extent of potentially pathogenic fungi on roots of diseased stock and within the soil in current and proposed plantation sites. The most common group of pathogens encountered was Fusarium spp.;...
Resource Type:: Technical Report

Creator:: James, Robert L., Trent, Andy, United States. Forest Health Protection, and United States. Forest Service. Northern Region
Abstract:: Fungal pathogens tend to accumulate within styroblock containers, which are reused to produce successive crops of container-grown seedlings. Most nurseries treat reused containers by immersing them in hot water for varying time periods. The efficacy of radio frequency waves (RFs) to reduce levels of selected groups of fungi within styroblock...
Resource Type:: Technical Report

Creator:: James, Robert L., United States. Forest Health Protection, and United States. Forest Service. Northern Region
Abstract:: Preplant soil treatments were implemented to determine effects on populations of potentiallypathogenic Fusarium and potentially disease-suppressive Trichoderma spp. as well as root colonization by these and other selected fungi on healthy-appearing, bare root 2-0 western white pine seedlings at the USDA Forest Service Nursery, Coeur d'Alene, Idaho. Soil treatments included...
Resource Type:: Technical Report

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