Rapid Measurement of Oleoresin Exudation Pressure in Pinus ponderosa Laws

1 March 1964

journal article
Published by Cambridge University Press (CUP) in The Canadian Entomologist

Vol. 96 (3) , 510-513
https://doi.org/10.4039/ent96510-3

Abstract

Improved techniques are described for cleaning gauges used in measuring the oleoresin exudation pressure (o.e.p.) of large numbers of ponderosa pines. These techniques are being used in a study of the relationship of o.e.p. and bark beetle attack in westside Sierra coniferous forests. Standard hydrostatic pressure gauges (Bourdon type) were modified by the addition of a threaded extension made of steel rod which permitted both insertion into a tree and newly-designed cleaning rack. A 9/32-in. hole in the steel rod reduced to a minimum the amount of oleoresin exudate necessary for an accurate reading. The cleaning racks, each accepting 30 gauges, were capped to confine the solvent (xylene) under pressure.

Keywords

This publication has 2 references indexed in Scilit:

Experiments on the Interrelationship Between Oleoresin Exudation Pressure in Pinus ponderosa and Attack by Ips confusus (Lec.) (Coleoptera: Scolytidae)
The Canadian Entomologist, 1962
Ecology of Scolytidae
Annual Review of Entomology, 1962