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Rapid Measurement of Oleoresin Exudation Pressure in Pinus ponderosa Laws1

Published online by Cambridge University Press:  31 May 2012

R. W. Bushing  and
D. L. Wood
R. W. Bushing
Affiliation:
Department of Entomology and Parasitology, University of California, Berkeley
D. L. Wood
Affiliation:
Department of Entomology and Parasitology, University of California, Berkeley
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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.

Type
Articles
Information
The Canadian Entomologist , Volume 96 , Issue 3 , March 1964 , pp. 510 - 513
Copyright
Copyright © Entomological Society of Canada 1964

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References

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