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Filtering by: Subject Lodgepole pine -- Diseases and pests -- Montana Advisor Ross, Darrell W. Degree Field Forest Science

Hazard rating system for spruce weevil (Pissodes strobi) in Sitka spruce in the northern Oregon Coast Range

Creator:

Lysak, Teresa

Abstract:

The spruce weevil (Pissodes strobi) is a serious pest of Sitka spruce in Oregon. Weevils cause damage by killing the leader of a tree, resulting in defects such as crooks and forks that can render the tree unmerchantable. In this study, spruce stands 16-25 years old were surveyed for weevil...

Resource Type:

Masters Thesis

Full Text:

weevil attacks in all cases. In studies with eastern white pine and white spruce, the percent of
Effects of environment and genetics on western pine shoot borer, Eucosma sonomana, infestation levels in ponderosa pine plantations of central Oregon

Creator:

Prueitt, Sara C.

Abstract:

Infestations of the western pine shoot borer (Eucosma sonomana Kearfott) in young stands of ponderosa pine (Pinusponderosa Lawson), were surveyed on the Deschutes National Forest. Elevation, slope, aspect, tree height, tree diameter, number of shoots in the terminal whorl, stand density, stand age and plant association for each stand were...

Resource Type:

Masters Thesis