Author: James P. Linnane
Publisher:
ISBN:
Category : Trees
Languages : en
Pages : 28

Get Book Here

Book Description

Author: James P. Linnane
Publisher:
ISBN:
Category : Trees
Languages : en
Pages : 28

Get Book Here

Book Description

Author: Terrence J. Rogers
Publisher:
ISBN:
Category : Bacilus thuringiensis
Languages : en
Pages : 26

Get Book Here

Book Description

Author: C. J. Sanders
Publisher: Ottawa, Ont. : Canadian Forestry Service
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 578

Get Book Here

Book Description

Author: United States. Forest Service. Pacific Northwest Region
Publisher:
ISBN:
Category : Spruce budworm
Languages : en
Pages : 148

Get Book Here

Book Description

Author:
Publisher:
ISBN:
Category : Predation (Biology)
Languages : en
Pages : 20

Get Book Here

Book Description

Author: Clinton E. Carlson
Publisher:
ISBN:
Category : Spruce budworm
Languages : en
Pages : 40

Get Book Here

Book Description

Author: Nicholas L. Crookston
Publisher:
ISBN:
Category : Western spruce budworm
Languages : en
Pages : 28

Get Book Here

Book Description

Author: United States. Forest Service. Northern Region
Publisher:
ISBN:
Category : Spruce budworm
Languages : en
Pages : 18

Get Book Here

Book Description

Author: Carroll B. Williams
Publisher:
ISBN:
Category : Pests
Languages : en
Pages : 16

Get Book Here

Book Description
Some field studies of the effects of various insecticides on the spruce budworm (Choristoneura sp.) and their parasites have shown severe suppression of host (budworm) populations and increased parasitism after treatment. Computer simulation using hypothetical models of spruce budworm-parasite systems based on these field data revealed that (1) effective parasites produce greater stability in budworm populations than ineffective ones and are more resistant to changes induced by insecticides; and (2) the level of budworm population suppression in most budworm·parasite systems is not proportional to the amount of insecticide applied. Only high insecticide dosages produce any effect on the budworm population. Cost-benefit analyses showed that very high investments are worthwhile, but moderate investments produce little effect. The study demonstrated that the computer simulation pmcess helps to define kinds of information needed for understanding the budworm-parasite system, and can predict system behavior under varying conditions.