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HOST RESISTANCE TO THE FIR ENGRAVER BEETLE, SCOLYTUS VENTRALIS (COLEOPTERA: SCOLYTIDAE): 4. EFFECT OF DEFOLIATION ON WOUND MONOTERPENE AND INNER BARK CARBOHYDRATE CONCENTRATIONS3

Published online by Cambridge University Press:  31 May 2012

L. C. Wright
Affiliation:
Washington State University, Pullman 99164
A. A. Berryman
Affiliation:
Washington State University, Pullman 99164
S. Gurusiddaiah
Affiliation:
Washington State University, Pullman 99164

Abstract

Monoterpene production, inner bark carbohydrate concentrations, and fir engraver attacks on grand fir were monitored for 3 years following Douglas-fir tussock moth defoliation. Monoterpenes were reduced for 2 years following defoliation. Defoliation caused a reduction in total sugars the first year following defoliation and a reduction in starch the second year. Total sugars and the previous year’s starch concentrations were positively correlated with monoterpene production. The trees which produced the least amounts of monoterpenes were the ones successfully attacked by the fir engraver.

Type
Articles
Copyright
Copyright © Entomological Society of Canada 1979

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