Author: Boyd E. WickmanPublisher:
ISBN:
Category : Abies concolor
Languages : en
Pages : 12
Book Description
Douglas Fir Tussock Moth Egg Hatch and Larval Development in Relation to Phenology of White Fir in Southern Orgeon
Author: Boyd E. WickmanPublisher:
ISBN:
Category : Abies concolor
Languages : en
Pages : 12
Book Description
Douglas Fir Tussock Moth Egg Hatch and Larval Development in Relation to Phenology of Grand Fir and Douglas-fir in Northeastern Oregon
Author: Boyd E. WickmanPublisher:
ISBN:
Category : Abies grandis
Languages : en
Pages : 20
Book Description
Audience Attention as a Basis for Evaluating Interpretive Presentations
Author: Ronald Eugene DickPublisher:
ISBN:
Category : Recreation areas
Languages : en
Pages : 470
Book Description
USDA Forest Service Research Paper PNW.
Author: Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 544
Book Description
Degree-day Accumulation Related to the Phenology of Douglas-fir Tussock Moth and White Fir During Five Seasons of Monitoring in Southern Oregon
Author: Boyd E. WickmanPublisher:
ISBN:
Category : Douglas-fir tussock moth
Languages : en
Pages : 12
Book Description
Monitoring Larval Populations of the Douglas-fir Tussock Moth and the Western Spruce Budworm on Permanent Plots
Author: Robert R. MasonPublisher:
ISBN:
Category : Douglas fir tussock moth
Languages : en
Pages : 32
Book Description
Procedures for monitoring larval populations of the Douglas-fir tussock moth and the western spruce budworm are recommended based on many years experience in sampling these species in eastern Oregon and Washington. It is shown that statistically reliable estimates of larval density can be made for a population by sampling host trees in a series of permanent plots in a geographical monitoring unit. The most practical method is to estimate simultaneously densities on a plot of both insect species by the nondestructive sampling of foliage on lower crown branches of host trees. This can be done either by counting all larvae on sample branches or by estimating the frequency of occurrence of a selected threshold number of larvae in samples. Statistics are given on the expected within- and between-plot variances and the number of sample plots needed in different sized monitoring units. In large monitoring units, plot densities of tussock moth and budworm larvae usually are not normally distributed, but they can be normalized by logarithmic transformation to predict the probability of subpopulations of any given density occurring somewhere in the unit. It is urged that sampling methods be consistent and that monitoring be done annually to accumulate continuous databases that reflect the behavior of defoliator populations over a long period.
Monitoring Larval Populations of the Douglas-fir Tussock Moth and the Western Spruce Budworm on Permanent Plots
Author: Richard R. MasonPublisher:
ISBN:
Category : Douglas fir tussock moth
Languages : en
Pages : 32
Book Description
The Douglas-fir Tussock Moth
Author: Robert W. CampbellPublisher:
ISBN:
Category : Agriculture
Languages : en
Pages : 360
Book Description
Errors from application of western hemlock site curves to mountain hemlock
Author: Francis R. HermanU.S.D.A. Forest Service Research Note PNW.
Author: Pacific Northwest Forest and Range Experiment Station (Portland, Or.)Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 262
Book Description