Other Scholarly Content
 

Status of the western hemlock looper in the northern region, 1972

Público Deposited

Contenido Descargable

Descargar PDF
https://ir.library.oregonstate.edu/concern/defaults/mc87pr803

Descriptions

Attribute NameValues
Creator
Abstract
  • Over 10,000 acres of aerially visible western hemlock looper defoliation on grand fir was detected on State and Federal forests of central Idaho in 1972. This is the first report of this insect building up in Region 1 since a widespread outbreak in 1937-39. The western hemlock looper has the potential of being one of the most destructive forest insects in North America. It can cause tree mortality in 1 or 2 years of feeding. Extensive tree mortality has been associated with nearly all past outbreaks. Outbreaks usually persist for about 3 years at epidemic levels prior to collapsing from natural control agents. Insecticides have been effective in protecting large stands during some looper infestations.
Resource Type
Fecha Disponible
Fecha de Emisión
Series
Subject
Declaración de derechos
Publisher
Language
File Format
File Extent
  • 1657294 bytes
Digitization Specifications
  • Scanned at 600 DPI using a Cannon DR-9080C in TIF format. PDF generated through Capture Perfect using OmniPage Professional 15 for textual OCR.
Replaces

Relaciones

Parents:

This work has no parents.

Elementos

Miniatura Título Fecha de subida Visibilidad Acciones
file details no._72-10_ocr.pdf 2017-07-19 Público Descargar