caa a22 4500 388093072 CHVBK 20180307125257.0 cr unu---uuuuu 161130e199912 xx s 000 0 eng 10.4039/Ent131831-6 doi S0008347X0001124X pii (NATIONALLICENCE)cambridge-10.4039/Ent131831-6 EVALUATION OF FACTORS AFFECTING TREE AND STAND SUSCEPTIBILITY TO THE DOUGLAS-FIR BEETLE (COLEOPTERA: SCOLYTIDAE) [Elektronische Daten] Tree and site characteristics were compared between 19 groups of Douglas-fir, Pseudotsuga menziesii (Mirb.) Franco (Pinaceae), infested by Douglas-fir beetle, Dendroctonus pseudotsugae Hopkins, and 19 uninfested groups to identify individual or combinations of characteristics associated with Douglas-fir beetle attacks. Of the tree characteristics, diameter, height, age, phloem thickness, bark thickness, and a standardized variable consisting of diameter divided by the last 10 years growth rate (DBHTYG) showed significant differences. None of the site characteristics showed significant differences between infested and uninfested areas. Two models, identified through discriminant analysis, placed 84 and 87% of the data in the correct infestation groups. These models included the variables diameter, height, phloem thickness, aspect, and DBHTYG in various combinations. The results were confirmed using a jackknifed cross-validation approach. These variables have potential for use in the development of a biological process model of tree and stand susceptibility to the Douglas-fir beetle. Copyright © Entomological Society of Canada 1999 Shore T.L. Canadian Forest Service, Natural Resources Canada, 506 W. Burnside Rd., Victoria, British Columbia, Canada V8Z 1M5 Safranyik L. Canadian Forest Service, Natural Resources Canada, 506 W. Burnside Rd., Victoria, British Columbia, Canada V8Z 1M5 Riel W.G. Canadian Forest Service, Natural Resources Canada, 506 W. Burnside Rd., Victoria, British Columbia, Canada V8Z 1M5 Ferguson M. Timberland Consultants Ltd., 2620 Granite Rd., Box 171, Nelson, British Columbia, Canada V1L 5P9 Castonguay J. BC Ministry of Forests, RR#1 1907 Ridgewood Rd., Nelson, British Columbia V1L 5P4, Canada The Canadian Entomologist Cambridge University Press 131/6(1999-12), 831-839 0008-347X 131:6<831 1999 131 TCE https://doi.org/10.4039/Ent131831-6 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.4039/Ent131831-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Shore T.L. Canadian Forest Service, Natural Resources Canada, 506 W. Burnside Rd., Victoria, British Columbia, Canada V8Z 1M5 NATIONALLICENCE 700 1- Safranyik L. Canadian Forest Service, Natural Resources Canada, 506 W. Burnside Rd., Victoria, British Columbia, Canada V8Z 1M5 NATIONALLICENCE 700 1- Riel W.G. Canadian Forest Service, Natural Resources Canada, 506 W. Burnside Rd., Victoria, British Columbia, Canada V8Z 1M5 NATIONALLICENCE 700 1- Ferguson M. Timberland Consultants Ltd., 2620 Granite Rd., Box 171, Nelson, British Columbia, Canada V1L 5P9 NATIONALLICENCE 700 1- Castonguay J. BC Ministry of Forests, RR#1 1907 Ridgewood Rd., Nelson, British Columbia V1L 5P4, Canada NATIONALLICENCE 773 0- The Canadian Entomologist Cambridge University Press 131/6(1999-12), 831-839 0008-347X 131:6<831 1999 131 TCE CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge