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AN EVALUATION OF A SCOLYTUS TSUGAE (COLEOPTERA: SCOLYTIDAE) INFESTATION IN A SMALL STAND OF DOUGLAS-FIR SAPLINGS IN NORTHERN IDAHO1

Published online by Cambridge University Press:  31 May 2012

John A. Schenk ,
Alan A. Berryman  and
John W. Dale
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Abstract

The distribution of attack by Scolytus tsugae (Swaine) between and within trees was evaluated in a small, isolated stand of Douglas-fir (Pseudotsuga menziesii var. glauca (Beissn.) Franco) saplings in northern Idaho. Distribution of attacked trees was determined from a complete inventory of the stand Within-tree distribution of attack was evaluated from sample bolts removed from three levels of each of nine sample trees. The infestation was concentrated (> 50%) in the 5-in. (12.7-cm) (dbh) trees during the 3-year outbreak period, but spread to the next smaller and larger diameter classes during the peak year. Approximately 52% of available host trees in each of the 5- and 7-in. (12.7- and 17.8-cm) diameter classes were killed during the outbreak. The lower and middle thirds of the bole sustained the highest number of attacks per ft2 (930 cm2). There was no significant difference in the percentage of successful attacks per ft2 (930 cm2) between tree level; however, the degree of success tended to increase with height in the tree.

Type
Articles
Information
The Canadian Entomologist , Volume 108 , Issue 10 , October 1976 , pp. 1079 - 1083
Copyright
Copyright © Entomological Society of Canada 1976

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References

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