Adkins, J.K. and Rieske, L.K. 2013. Loss of a foundation forest species due to an exotic invader impacts terrestrial arthropod communities. Forest Ecology and Management, 295: 126–135. https://doi.org/10.1016/j.foreco.2013.01.012.
Brantley, S., Ford, C.R., and Vose, J.M. 2013. Future species composition will affect forest water use after loss of eastern hemlock from southern Appalachian forests. Ecological Applications, 23: 777–790. https://doi.org/10.1890/12-0616.1.
Canadian Food Inspection Agency. 2017. News release: hemlock woolly adelgid confirmed in Nova Scotia [online]. Available from https://www.canada.ca/en/food-inspection-agency/news/2017/08/hemlock_woolly_adelgidconfirmedinnovascotia.html. [accessed 12 December 2017].
Cessna, J.F. and Nielsen, C. 2012. Influences of hemlock woolly adelgid-induced stand-level mortality on nitrogen cycling and stream water nitrogen concentrations in southern Pennsylvania. Castanea, 77: 127–135. https://doi.org/10.2179/11-025.
Costa, S. and Onken, B. 2006. Standardizing sampling for detection and monitoring of hemlock woolly adelgid in eastern hemlock forests. United States Department of Agriculture Forest Service, Forest Health Technology Enterprise Team, Washington, District of Columbia, United States of America.
Evans, A.M. and Gregoire, T.E. 2007. The tree crown distribution of hemlock woolly adelgid, Adelges tsugae (Hem., Adelgidae) from randomized branch sampling. Journal of Applied Entomology, 131: 26–33. https://doi.org/10.1111/j.1439-0418.2006.01121.x.
Farrar, J.L. 1995. Trees in Canada. Fitzhenry and Whiteside Limited, Markham, Ontario, Canada.
Fidgen, J.G., Legg, D.E., and Salom, S.M. 2006. Binomial sequential sampling plan for hemlock woolly adelgid (Hemiptera: Adelgidae) sistens infesting individual eastern hemlock trees. Journal of Economic Entomology, 99: 1500–1508. https://doi.org/10.1603/0022-0493-99.4.1500.
Fidgen, J.G., Legg, D.E., and Salom, S.M. 2013. A sequential sampling plan for counts of Adelges tsugae on individual eastern hemlock trees. Southern Journal of Applied Forestry, 37: 75–80. https://doi.org/10.5849/sjaf.11-029.
Fidgen, J.G., Whitmore, M.C., and Turgeon, J.J. 2016. Ball sampling, a novel method to detect Adelges tsugae (Hemiptera: Adelgidae) in hemlock (Pinaceae). The Canadian Entomologist, 148: 118–121. https://doi.org/10.4039/tce.2015.29.
Gray, D.R., Evans, R.A., and Salom, S.M. 1998. Hemlock woolly adelgid (Homoptera: Adelgidae) dispersion and the failure of binomial sampling to estimate population density. Environmental Entomology, 27: 564–571. https://doi.org/10.1093/ee/27.3.564.
Hothorn, T., Bretz, F., and Westfall, P. 2008. Simultaneous inference in general parametric models. Biometrical Journal, 50: 346–363. https://doi.org/10.1002/bimj.200810425.
Hughes, C., Johns, R., and Sweeney, J. 2014. A technical guide to installing beetle traps in the upper canopy. Journal of the Acadian Entomological Society, 10: 12–18.
Jenkins, J.C., Aber, J.D., and Canham, C.D. 1999. Hemlock woolly adelgid impacts on community structure and N cycling rates in eastern hemlock forests. Canadian Journal of Forest Research, 29: 630–645. https://doi.org/10.1139/x99-034.
Joseph, S.V., Hanula, J.L., and Braman, S.K. 2011. Distribution and abundance of Adelges tsugae (Hemiptera: Adelgidae) within hemlock trees. Journal of Economic Entomology, 104: 1918–1927. https://doi.org/10.1603/EC11022.
Krapfl, K.J., Holzmueller, E.J., and Jenkins, M.A. 2011. Early impacts of hemlock woolly adelgid in Tsuga canadensis forest communities of the southern Appalachian Mountains. Journal of the Torrey Botanical Society, 138: 93–106. https://doi.org/10.3159/10-RA-031.1.
Lenth, R. 2017. Emmeans: estimated marginal means, aka least-squares means [online]. Available from https://CRAN.R-project.org/package=emmeans [accessed 12 January 2018].
McAvoy, T.J., Mays, R., Johnson, N.G., and Salom, S.M. 2017. The effects of shade, fertilizer, and pruning on eastern hemlock trees and hemlock woolly adelgid. Forests, 8(156): 1–18. https://doi.org/10.3390/f8050156.
McClure, M.S. 1987. Biology and control of hemlock woolly adelgid. Bulletin 851. The Connecticut Agricultural Experiment Station, New Haven, Connecticut, United States of America.
McClure, M.S. 1990. Role of wind, birds, deer, and humans in the dispersal of hemlock woolly adelgid (Homoptera: Adelgidae). Environmental Entomology, 19: 36–43. https://doi.org/10.1093/ee/19.1.36.
McClure, M.S. 1991. Density-dependent feedback and population cycles in Adelges tsugae (Homoptera: Adelgidae) on Tsuga canadensis
. Environmental Entomology, 20: 258–264. https://doi.org/10.1093/ee/20.1.258.
Mech, A.M., Tobin, P.C., Teskey, R.O., Rhea, J.R., and Gandhi, KJK 2017. Increases in summer temperatures decrease the survival of an invasive forest insect. Biological Invasions, 20: 365–374. https://doi.org/10.1007/s10530-017-1537-7.
North American Plant Protection Organization. 2015. Phytosanitary alert system [online]. Available from http://www.pestalert.org/opr_search.cfm [accessed 11 June 2015].
Nuckolls, A.E., Wurzburger, N., Ford, C.R., Hendrick, R.L., Vose, J.M., and Kloeppel, B.D. 2009. Hemlock declines rapidly with hemlock woolly adelgid infestation: impacts on the carbon cycle of southern Appalachian forests. Ecosystems, 12: 179–190. https://doi.org/10.1007/s10021-008-9215-3.
Pedigo, L.P. 1993. Introduction to sampling arthropod populations. In Handbook of sampling methods for arthropods in agriculture. Edited by L.P. Pedigo and G.D. Buntin. CRC Press, Boca Raton, Florida, United States of America. Pp. 1–14.
R Core Team. 2017. R: a language and environment for statistical computing [online]. R Foundation for Statistical Computing, Vienna, Austria. Available from www.R-project.org [accessed 12 December 2017].
Spaulding, H.L. and Rieske, L.K. 2010. The aftermath of an invasion: structure and composition of central Appalachian hemlock forests following establishment of the hemlock woolly adelgid, Adelges tsugae
. Biological Invasions, 12: 3135–3143. https://doi.org/10.1007/s10530-010-9704-0.
Tobin, P.C., Turcotte, R.M., Blackburn, L.M., Juracko, J.A., and Simpson, B.T. 2017. The big chill: quantifying the effect of the 2014 North American cold wave on hemlock woolly adelgid populations in the central Appalachian Mountains. Population Ecology, 59: 251–258. https://doi.org/10.1007/s10530-013-0421-3.
United States Department of Agriculture, Forest Service. 2016. Forest health protection forest pest conditions [online]. Available from http://foresthealth.fs.usda.gov/portal/Flex/FPC [accessed 14 December 2017].
Youngentob, K.N., Zdenek, C., and van Gorsel, E. 2016. A simple and effective method to collect leaves and seeds from tall trees. Methods in Ecology and Evolution, 7: 1119–1123. https://doi.org/10.1111/2041-210X.12554.
Zuur, A.F., Ieno, E.N., Walker, N.J., Saveliev, A.A., and Smith, G.M. 2009. Mixed effects models and extensions in ecology with R. Springer, New York, New York, United States of America. https://doi.org/10.1007/978-0-387-87458-6.