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Douglas-Fir Beetle Infestations Are Associated with Certain Rock and Stand Types in the Inland Northwestern United States Item Info

Landscape-level geographic analysis was used to examine the occurrence of Dendroctonus pseudotsugae Hopkins (Coleoptera: Scolytidae) in association with geology (rock type) and forest stand types on the Panhandle National Forests of northern Idaho and northeastern Washington from 1996 to 1999. Beetle infestations occurred most often in mature stands comprised primarily of trees 23 cm in diameter at breast height ( 1.4 m), in habitat types likely to contain Douglas-fir. Douglas-fir stands growing on Prichard and lower Wallace formation metasedimentary rocks and intrusive dikes and sills were signicantly more likely than Douglas-fir stands growing on other rock types to harbor beetle populations during nonoutbreak years early in the study period. By 1999 (when outbreak populations of Douglas-fir beetle were present), beetle infestations occurred across all rock types at rates proportional to the amount ofstand area on those rocks, indicating a decrease in infestation rates for stands on particular rock types when beetle populations were large. Although the biological mechanisms influencing beetle preferences were not examined, information derived in this study could be useful in developing quantitative hazard-rating models for Douglas-fir beetle, and, subsequently, in designing silvicultural practices to reduce the amount of beetle-susceptible Douglas-fir stands on particular rock types.

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Title:
Douglas-Fir Beetle Infestations Are Associated with Certain Rock and Stand Types in the Inland Northwestern United States
Creator:
Garrison-Johnston, M.T.; Moore, J.A.; Cook, S.P.; Niehoff, G.J.
Date Created (ISO Standard):
2003-08-12
Description:
Landscape-level geographic analysis was used to examine the occurrence of Dendroctonus pseudotsugae Hopkins (Coleoptera: Scolytidae) in association with geology (rock type) and forest stand types on the Panhandle National Forests of northern Idaho and northeastern Washington from 1996 to 1999. Beetle infestations occurred most often in mature stands comprised primarily of trees 23 cm in diameter at breast height ( 1.4 m), in habitat types likely to contain Douglas-fir. Douglas-fir stands growing on Prichard and lower Wallace formation metasedimentary rocks and intrusive dikes and sills were signicantly more likely than Douglas-fir stands growing on other rock types to harbor beetle populations during nonoutbreak years early in the study period. By 1999 (when outbreak populations of Douglas-fir beetle were present), beetle infestations occurred across all rock types at rates proportional to the amount ofstand area on those rocks, indicating a decrease in infestation rates for stands on particular rock types when beetle populations were large. Although the biological mechanisms influencing beetle preferences were not examined, information derived in this study could be useful in developing quantitative hazard-rating models for Douglas-fir beetle, and, subsequently, in designing silvicultural practices to reduce the amount of beetle-susceptible Douglas-fir stands on particular rock types.
Subjects:
research (document genres) forest management timber (lumber) wood borers (beetles)
Location:
North and Central Idaho; Eastern Washington; Western Montana; Northeastern Oregon
Publisher:
Environmental Entomology
Source:
Garrison-Johnston, M.T., J.A. Moore, G.J. Niehoff, S. Cook. 2003. Analysis. Douglas-fir Beetle Infestations Are Associated with Certain Rock and Stand Types in the Inland Northwestern United States. Environmental Entomology. 32(6): 1354-1363.
Source Identifier:
DF_Beetle_Infestations_are_Associated_with_Certain_Rock_Stands_Types_in_the_Inland_NW_United_States_EE_032_06_2003
Type:
text
Format:
application/pdf

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Preferred Citation:
"Douglas-Fir Beetle Infestations Are Associated with Certain Rock and Stand Types in the Inland Northwestern United States", Idaho Forestry Research Collection, University of Idaho Library Digital Collections, https://www.lib.uidaho.edu/digital/forestryresearch/items/forestryresearch934.html
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