Author: Publisher:
ISBN:
Category : Defoliation
Languages : en
Pages : 20
Book Description
Susceptibility of Stands to Defoliation by Western Spruce Budworm on the Payette National Forest, Idaho
Author: Boise National Forest (N.F.)/Payette National Forest (N.F.), Western Spruce Budworm Management
Author: Forest Insect and Disease Conditions in the United States
Author: United States. Forest ServicePublisher:
ISBN:
Category : Forest insects
Languages : en
Pages : 92
Book Description
Forest Insect and Disease Conditions in the United States
Author: Forest Insect and Disease Conditions in the United States, 1978
Author: Research Paper PNW.
Author: Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 348
Book Description
Stem Volume Losses in Grand Firs Topkilled by Western Spruce Budworm in Idaho
Author: George T. FerrellPublisher:
ISBN:
Category : Defoliation
Languages : en
Pages : 16
Book Description
Mature grand firs (Abies grandis [Dougl. ex D. Don] Lindl.) were sampled in two stands, one cutover and one virgin, in the Little Salmon River drainage in west-central Idaho, to estimate stem volume losses associated with topkilling. Damage to the stands resulted from three outbreaks of western spruce budworm (Choristoneura occidentalis Freeman) in 1922-30, 1952-55, and 1969-78. Stems of the firs were dissected and examined for reductions in height and radial growth, stem deformities, and decay associated with topkills. Merchantable volume losses (to a minimum 4-inch diameter top) were calculated for each outbreak. Greatest volume loss was associated with tops killed by the 1922-30 outbreak. Loss varied widely among the trees and stands sampled. In the cutover stand, which received a sanitation cutting in the late 1960's, firs topkilled by the 1922-30 outbreak averaged losses of 9.5 ft3 (0.3 m3), amounting to 11.1 percent of merchantable stem volume. In the vigin stand, losses averaged 26.3 ft3 (0.3 m3) or 20.5 percent of stem volume. Topkill-associated decays, caused mainly by Indian paint fungus (Echinodontium tinctorium Ell. and Ev.) were responsible for most of this loss. Smaller volume losses were recorded in firs topkilled by the 1952-55 outbreak. Losses per tree averaged 3.3 ft3 (0.1 m3) or 5.4 percent in the cutover stand, and 0.5 ft3 (0.02 m3) or 0.3 percent in the virgin stand. These losses resulted mainly from height growth reductions rather than decay. No merchantable volume losses were recorded for the 1969-78 outbreak.
Population Dynamics of the Major North American Needle-eating Budworms
Author: Robert W. CampbellPublisher:
ISBN:
Category : Insect populations
Languages : en
Pages : 244
Book Description
Seed Dissemination in Small Clearcuttings in North-central California
Author: Philip M. McDonaldPublisher:
ISBN:
Category : Clearcutting
Languages : en
Pages : 796
Book Description
In a 1964-1967 study on the Challenge Experimental Forest, seedfall was evaluated in 2-, 5-, and 10-acre circular clearcuttings. During the 4 years, 10 seed crops, ranging from light to bumper, were produced by ponderosa pine. white fir, Douglas-fir, and incense cedar. Seedfall ranged from 76 to 40,691 sound seed per acre (188 to 100,547/ha) for a single species in a given year. From 89 to 100 percent of each species' seed fell within an area 1 1/2 times the height of the average dominant tree. Overall, seed distribution was highly variable.
Author: