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Notes: A Simple Technique for Measuring Oleoresin Exudation Flow in Pines

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Oleoresin is a factor in repelling the attacks of some tree-killing bark beetles. Quantitative characteristics of resin can be estimated in pines by measuring the initial rate of oleoresin exudation flow through a capillary tube inserted in the sapwood. Such measurements are a quick and inexpensive way of evaluating resin potential that may be related to resistance of different trees to certain bark beetles.

Document Type: News

Affiliations: Entomologist, Forest Sciences Laboratory, Pacific Northwest Forest and Range Expt. Sta., Forest Serv., U. S. Dept. of Agric., Corvallis, Oregon

Publication date: March 1, 1969

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