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Book Sampling Populations of Western Spruce Budworm and Predicting Defoliation on Douglas Fir in Eastern Oregon Classic Reprint

Download or read book Sampling Populations of Western Spruce Budworm and Predicting Defoliation on Douglas Fir in Eastern Oregon Classic Reprint written by Valentine M. Carolin and published by Forgotten Books. This book was released on 2018-09-07 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Sampling Populations of Western Spruce Budworm and Predicting Defoliation on Douglas-Fir in Eastern Oregon A cluster design appeared to be the best solution for sampling these stages. For low, medium, and high populations, number and size of clusters per stand and number of stands were determined for means with an acceptable sampling error of 20 percent, at p z 0. 05, and also other precision and confidence levels. Sampling requirements were particularly great for low egg populations and medium populations of larvae in buds. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

Book Sampling Populations of Western Spruce Budworm and Predicting Defoliation on Douglas fir in Eastern Oregon

Download or read book Sampling Populations of Western Spruce Budworm and Predicting Defoliation on Douglas fir in Eastern Oregon written by Valentine M. Carolin and published by . This book was released on 1972 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Monitoring Larval Populations of the Douglas fir Tussock Moth and the Western Spruce Budworm on Permanent Plots

Download or read book Monitoring Larval Populations of the Douglas fir Tussock Moth and the Western Spruce Budworm on Permanent Plots written by Robert R. Mason and published by . This book was released on 1994 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Book Prediction of Western Spruce Budworm Defoliation on Douglas Fir Classic Reprint

Download or read book Prediction of Western Spruce Budworm Defoliation on Douglas Fir Classic Reprint written by Allan T. Bullard and published by Forgotten Books. This book was released on 2018-03-18 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Prediction of Western Spruce Budworm Defoliation on Douglas-Fir Use of the appropriate model will allow prediction into the correct defoliation category 8 out of 10 times. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

Book Historical Patterns of Western Spruce Budworm and Douglas fir Tussock Moth Outbreaks in the Northern Blue Mountains Oregon Since A D 1700

Download or read book Historical Patterns of Western Spruce Budworm and Douglas fir Tussock Moth Outbreaks in the Northern Blue Mountains Oregon Since A D 1700 written by and published by . This book was released on 1995 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Evaluation of Multiple Regression Models for Prediction of Western Spruce Budworm Defoliation on Douglas Fir Classic Reprint

Download or read book Evaluation of Multiple Regression Models for Prediction of Western Spruce Budworm Defoliation on Douglas Fir Classic Reprint written by Allan T. Bullard and published by Forgotten Books. This book was released on 2018-03-18 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Evaluation of Multiple Regression Models for Prediction of Western Spruce Budworm Defoliation on Douglas-Fir No changes were made in the methods previously described by Bullard and Young (1980) for collection of egg mass and defoliation estimation data. Form 1 was designed and distributed to the field for collection of physical data describing those clusters already contained in the data base and any new clusters being added. Variables included were slope, aspect, elevation, physiographic location, stand structure, species composition, and basal area. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

Book Comparison of Western Spruce Budworm Populations and Damage on Grand Fir and Douglas Fir Trees Classic Reprint

Download or read book Comparison of Western Spruce Budworm Populations and Damage on Grand Fir and Douglas Fir Trees Classic Reprint written by V. M. Carolin and published by Forgotten Books. This book was released on 2017-11-18 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Comparison of Western Spruce Budworm Populations and Damage on Grand Fir and Douglas-Fir Trees Pap. Pnw - l95, 16 p. Illus. Pacific Northwest Forest and Range Experiment Station, Portland, Oregon. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

Book Resistance of Douglas fir to Western Spruce Budworm

Download or read book Resistance of Douglas fir to Western Spruce Budworm written by Geral I. McDonald and published by . This book was released on 1979 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Estimating Defoliation of Douglas fir and White Fir by the Western Budworm

Download or read book Estimating Defoliation of Douglas fir and White Fir by the Western Budworm written by M. E. McKnight and published by . This book was released on 1969 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: A figure and a table are presented for estimating defoliation by the western budworm (Choristoneura occidentalis) from counts of undamaged shoots. the estimates are made on foliage samples taken for budworm egg mass surveys.

Book Historical Patterns of Western Spruce Budworm and Douglas Fir Tussock Moth Outbreaks in the Northern Blue Mountains Oregon Since A D 1700 Classic Reprint

Download or read book Historical Patterns of Western Spruce Budworm and Douglas Fir Tussock Moth Outbreaks in the Northern Blue Mountains Oregon Since A D 1700 Classic Reprint written by Thomas W. Swetnam and published by Forgotten Books. This book was released on 2017-11-19 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Historical Patterns of Western Spruce Budworm and Douglas-Fir Tussock Moth Outbreaks in the Northern Blue Mountains, Oregon, Since A. D. 1700 The objectives of this study were to reconstruct and analyze a multicentury history of budworm and tussock moth outbreaks in old-growth mixed-conifer stands of the north ern Blue Mountains and Eagle Cap edemess in northeastern Oregon. We were par ticularly interested in assessing possible changes in outbreak dynamics in the 2oth century relative to previous centuries. Our starting point for this study was observa tions of radial growth responses to defoliation by these two insects in previous tree ring studies conducted within the region (brubaker 1978; Brubaker and Greene 1979; Vcman 1980, From this work it was evident that characteristic tree-ring pat terns (hereafter called signatures) caused by budworms and tussock moths might be detected and isolated in radial increment time series. Following this lead, we applied dendrochronological methods developed and demonstrated in the southern Rocky Mountains (swetnam and others 1985; Swetnam and Lynch 1989, 1993) to tree-ring collections from the Blue Mountains. In this paper, we describe the results of our investigations in the northern Blue Mountains; we focused primarily on the historical patterns of change in regional-scale outbreaks among all sampled stands. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.