Other Scholarly Content
 

Potential for defoliation of ponderosa pine stands by pine butterfly on the Bitterroot and Lolo National Forests, Montana in 1972

Public Deposited

Downloadable Content

Download PDF
https://ir.library.oregonstate.edu/concern/defaults/5712m794v

Descriptions

Attribute NameValues
Creator
Abstract
  • Epidemic levels of the pine butterfly, Neophasia menapia (Felder and Felder) have been evident in ponderosa pine stands in the Bitter Root Valley since 1969. Evaluations of this infestation were initiated in 1970 to assess overwintering egg populations at 20 locations within the infestation (Ciesla et al. 1971). Defoliation was estimated following the feeding period in 1971 and a linear regression model was computed using defoliation as the dependent variable and egg density as the independent variable (Bousfield and Ciesla 1971). The purpose of this study was to provide a basis for predicting future population levels. The objective of this evaluation is to test the prediction model, forecast 1972 defoliation potential, and to obtain additional biological information on the infestation.
Resource Type
Date Available
Date Issued
Series
Subject
Rights Statement
Publisher
Language
File Format
File Extent
  • 4029348 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

Relationships

Parents:

This work has no parents.

Items

Thumbnail Title Date Uploaded Visibility Actions
file details no._72-9_ocr.pdf 2017-07-20 Public Download