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Photochemical oxidant injury and bark beetle (Coleoptera: Scolytidae) infestation of Ponderosa pine: III. Effect of injury upon oleoresin composition, phloem carbohydrates, and phloem pH

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  • Miller, P. R.
  • Cobb, F. W.
  • Zavarin, E.

Abstract

The series of papers in this issue presents the results of studies to determine (a) the degree of association between photochemical atmospheric pollution injury to ponderosa pine and infestation by bark beetles (paper I), and (b) the changes in the physiology of diseased trees which might influence host susceptibility to bark beetles (papers II and III). The results show that oxidant injury does, in fact, predispose ponderosa pine to beetle infestation, and that the injury leads to physiological changes in the host which may be related to increased bark beetle susceptibility. The significance of these results in relation to the present knowledge on bark beetle ecology and host susceptibility is discussed in paper IV.

Suggested Citation

  • Miller, P. R. & Cobb, F. W. & Zavarin, E., 1968. "Photochemical oxidant injury and bark beetle (Coleoptera: Scolytidae) infestation of Ponderosa pine: III. Effect of injury upon oleoresin composition, phloem carbohydrates, and phloem pH," Hilgardia, California Agricultural Experiment Station, vol. 39(6).
    • Handle: RePEc:ags:hilgar:381571
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