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Evaluating possible intraspecific variation in resistance of western hemlock (Pinaceae) to Adelges tsugae (Hemiptera: Adelgidae)

Published online by Cambridge University Press:  02 October 2019

Alexander Rose ,
Darrell W. Ross Open the ORCID record for Darrell W. Ross [Opens in a new window]  and
Kimberly F. Wallin
Alexander Rose
Affiliation:
Department of Forest Ecosystems and Society, Oregon State University, Corvallis, Oregon, 97331, United States of America
Darrell W. Ross*
Affiliation:
Department of Forest Ecosystems and Society, Oregon State University, Corvallis, Oregon, 97331, United States of America
Kimberly F. Wallin
Affiliation:
Rubenstein School of Environment and Natural Resources, The University of Vermont, Burlington, Vermont, 05405, United States of America United States Department of Agriculture Forest Service, Northern Research Station, Burlington, Vermont, 05405, United States of America
*
1Corresponding author (e-mail: darrell.ross@oregonstate.edu)
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Abstract

Western hemlock, Tsuga heterophylla (Rafinesque) Sargent (Pinaceae), trees growing in a clonal, commercial seed orchard on Whidbey Island, Washington, United States of America were assessed for Adelges tsugae (Annand) (Hemiptera: Adelgidae) infestation levels to determine whether there was any evidence of resistance to this herbivore. Join-count statistics revealed that A. tsugae infested trees were not clumped, but instead were randomly distributed throughout the seed orchard. Chi-square analyses suggested that there is a genetic basis for different levels of A. tsugae infestation among the genets represented in the orchard. However, since none of the genets were completely free of A. tsugae infestation, differences among genets seem to be related more to susceptibility or tolerance than complete resistance. Among the 17 genets that had five or more ramets in the seed orchard, only one had more than one ramet free of A. tsugae. That genet had four of five ramets that were free of A. tsugae. However, it is not possible to say whether that was due to chance or inherent tree characteristics that make it less susceptible to A. tsugae infestation.

Type
Behaviour and Ecology
Information
The Canadian Entomologist , Volume 151 , Issue 6 , December 2019 , pp. 777 - 782
Copyright
© Entomological Society of Canada 2019 

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Footnotes

Subject editor: Therese Poland

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