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Feeding by Leucopis argenticollis and Leucopis piniperda (Diptera: Chamaemyiidae) from the western USA on Adelges tsugae (Hemiptera: Adelgidae) in the eastern USA

Published online by Cambridge University Press:  14 March 2017

K. Motley
Affiliation:
Rubenstein School of Environment and Natural Resources, The University of Vermont, Burlington, VT 05405, USA
N.P. Havill
Affiliation:
USDA Forest Service, Northern Research Station, Hamden, CT, USA
A.L. Arsenault-Benoit
Affiliation:
Rubenstein School of Environment and Natural Resources, The University of Vermont, Burlington, VT 05405, USA
A.E. Mayfield
Affiliation:
USDA Forest Service, Southern Research Station, Asheville, NC 28804, USA
D.S. Ott
Affiliation:
Department of Forest Ecosystems and Society, Oregon State University, Corvallis, OR 97331, USA
D. Ross
Affiliation:
Department of Forest Ecosystems and Society, Oregon State University, Corvallis, OR 97331, USA
M.C. Whitmore
Affiliation:
Department of Natural Resources, Cornell University, Ithaca, NY 14853, USA
K.F. Wallin*
Affiliation:
Rubenstein School of Environment and Natural Resources, The University of Vermont, Burlington, VT 05405, USA USDA Forest Service, Northern Research Station, Burlington, VT 05403, USA
*
*Author for correspondence Phone: 802-656-2517 Fax: 802-656-8683 E-mail: kwallin@uvm.edu

Abstract

Leucopis argenticollis (Zetterstedt) and Leucopis piniperda (Malloch) are known to feed on the lineage of Adelges tsugae Annand that is native to western North America, but it is not known if they will survive on the lineage that was introduced from Japan to the eastern USA. In 2014, western Leucopis spp. larvae were brought to the laboratory and placed on A. tsugae collected in either Washington (North American A. tsugae lineage) or Connecticut (Japanese lineage). There were no significant differences in survival or developmental times between flies reared on the two different adelgid lineages. In 2015 and 2016, western Leucopis spp. adults were released at two different densities onto enclosed branches of A. tsugae infested eastern hemlock (Tsuga canadensis (L.) Carr.) in Tennessee and New York. Cages were recovered and their contents examined 4 weeks after release at each location. Leucopis spp. larvae and puparia of the F1 generation were recovered at both release locations and adults of the F1 generation were collected at the Tennessee location. The number of Leucopis spp. offspring collected increased with increasing adelgid density, but did not differ by the number of adult flies released. Flies recovered from cages and flies collected from the source colony were identified as L.argenticollis and L. piniperda using DNA barcoding. These results demonstrate that Leucopis spp. from the Pacific Northwest are capable of feeding and developing to the adult stage on A. tsugae in the eastern USA and they are able to tolerate environmental conditions during late spring and early summer at the southern and northern extent of the area invaded by A. tsugae in the eastern USA.

Type
Research Papers
Copyright
Copyright © Cambridge University Press 2017 

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