Sampling Low Density Populations Of The Douglas Fir Tussock Moth By Frequency Of Occurrence In The Lower Tree Crown
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Sampling Low Density Populations Of The Douglas Fir Tussock Moth By Frequency Of Occurrence In The Lower Tree Crown
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Author : Richard R. Mason
language : en
Publisher:
Release Date : 1977
Sampling Low Density Populations Of The Douglas Fir Tussock Moth By Frequency Of Occurrence In The Lower Tree Crown written by Richard R. Mason and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with Douglas-fir tussock moth categories.
Sampling Low Density Populations Of The Douglas Fir Tussock Moth By Frequency Of Occurrence In The Lower Tree Crown Classic Reprint
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Author : Richard R. Mason
language : en
Publisher: Forgotten Books
Release Date : 2018-03-17
Sampling Low Density Populations Of The Douglas Fir Tussock Moth By Frequency Of Occurrence In The Lower Tree Crown Classic Reprint written by Richard R. Mason and has been published by Forgotten Books this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-03-17 with Mathematics categories.
Excerpt from Sampling Low Density Populations of the Douglas-Fir Tussock Moth by Frequency of Occurrence in the Lower Tree Crown The first criterion of standard ization can be satisfied by a basic relationship that exists between the mean density of larvae and the pro portion of sample units that contain one or more larvae. When larvae are abundant in an area, they will appear in a greater proportion of the samples than when they are rare. The exact form of this relationship depends on the size of the sample unit and the frequency distribution of data. The relationship can be determined by regression analysis or by fitting a theoretical mathematical distribution to field data. 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.
Sampling Low Density Populations Of The Douglas Fir Tussock Moth By Frequency Of Occurrence In The Lower Tree Crown
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Author : Richard R. Mason
language : en
Publisher:
Release Date : 1977
Sampling Low Density Populations Of The Douglas Fir Tussock Moth By Frequency Of Occurrence In The Lower Tree Crown written by Richard R. Mason and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with Douglas fir tussock moth categories.
Detecting Suboutbreak Populations Of The Douglas Fir Tussock Moth By Sequential Sampling Of Early Larvae In The Lower Tree Crown
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Author : Richard R. Mason
language : en
Publisher:
Release Date : 1978
Detecting Suboutbreak Populations Of The Douglas Fir Tussock Moth By Sequential Sampling Of Early Larvae In The Lower Tree Crown written by Richard R. Mason and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1978 with Douglas-fir tussock moth categories.
A sequential sampling plan is described for identifying tussock moth populations which, at a maximum expected rate of increase, could be within 1 year of outbreak status. The plan uses a new technique of sampling early larvae by the nondestructive examination of lower crown foliage. Larvae at inconspicuous low densities are classified into relatively low or high categories by their frequency of occurrence on foliage samples. The sampling plan is applied independently on individual plots to classify the density of each plot. It is an appropriate method for quickly screening suboutbreak populations in ground evaluation surveys.
Monitoring Larval Populations Of The Douglas Fir Tussock Moth And The Western Spruce Budworm On Permanent Plots
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Author : Robert R. Mason
language : en
Publisher:
Release Date : 1994
Monitoring Larval Populations Of The Douglas Fir Tussock Moth And The Western Spruce Budworm On Permanent Plots written by Robert R. Mason and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Douglas fir tussock moth categories.
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.
Sampling Low Density Populations Of The Douglas Fir Tussock Mot By Frequency Of Occurence In The Lower Tree Crown
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Author : Richard R. Mason
language : en
Publisher:
Release Date : 1977
Sampling Low Density Populations Of The Douglas Fir Tussock Mot By Frequency Of Occurence In The Lower Tree Crown written by Richard R. Mason and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with categories.
Monitoring Larval Populations Of The Douglas Fir Tussock Moth And The Western Spruce Budworm On Permanent Plots
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Author : Richard R. Mason
language : en
Publisher:
Release Date : 1994
Monitoring Larval Populations Of The Douglas Fir Tussock Moth And The Western Spruce Budworm On Permanent Plots written by Richard R. Mason and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Douglas fir tussock moth categories.
Agriculture Handbook
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Author :
language : en
Publisher:
Release Date : 1949
Agriculture Handbook written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1949 with Agriculture categories.
Set includes revised editions of some issues.
How To Sample Douglas Fir Tussock Moth Larvae
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Author : Richard R. Mason
language : en
Publisher:
Release Date : 1979
How To Sample Douglas Fir Tussock Moth Larvae written by Richard R. Mason and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1979 with Caterpillars categories.
The Douglas Fir Tussock Moth
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Author : Robert W. Campbell
language : en
Publisher:
Release Date : 1978
The Douglas Fir Tussock Moth written by Robert W. Campbell and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1978 with Agriculture categories.
