Effects of induced translocation stress and bark beetle attack (Dendroctonus ponderosae) on heat pulse velocity and the dynamic wound response of lodgepole pine (Pinus contorta var. latifolia)
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Abstract
The effects of induced translocation stress upon heat pulse velocity, reactions to pathogenic fungi, and bark beetle attack dynamics were compared before, during, and after severe cooling of the bole and after girdling of xylem and phloem in Pinus contorta Douglas var. latifolia Engelmann. Cooled trees evidenced a reduction of heat pulse velocity and the elimination of observable wound responses, which returned to normal upon cessation of the stress the following year. A tree naturally attacked and colonized by Dendroctonus ponderosae Hopkins also evidenced reduced heat pulse velocity within 2 weeks of bark beetle attack. Heat pulse velocity in girdled trees did not change. Stress due to drought and (or) bark beetle attack in nature may be analogous to that induced by cooling. Such stress may reduce a tree's ability to resist bark beetle attack and fungus invasion.
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