Robert G. Ahern, Ph. D.
Biology, evolution, and management of invasive species
 

Refereed Publications

Ahern, R. G., D. J. Hawthorne, and M. J. Raupp. Reduced genetic and phenotypic variation in Adelges cooleyi, an insect pest introduced to the eastern United States. Accepted to Biological Invasions.

Raupp, M., R. Ahern, B. Onken, R. Reardon , S. Bealmear, J. Doccola, P. Wolfe II, and P. Becker. Efficacy of foliar applications, trunk injections, and soil drenches in reducing populations of elongate hemlock scale on eastern hemlock. Submitted to Journal of Arboriculture and Urban Forestry.

Frank, S., R. Ahern, and M. Raupp. 2007. Does imidacloprid reduce defoliation by Japanese beetles on linden for more than one growing season? Journal of Arboriculture. 33: 392-396.

Ahern, R. G., S. D. Frank, and M. J. Raupp. 2005. Comparison of exclusion and imidacloprid for reduction of oviposition damage to young trees by periodical cicadas (Hemiptera: Cicadidae). Journal of Economic Entomology 98: 2133-2136.

Raupp, M. J., R. E. Webb, A. Szczepaniec, D. Booth, and R. G. Ahern. 2004. Incidence, abundance, and severity of mites on hemlocks following applications of imidicloprid. Journal of Arboriculture 30(2): 108-113.

Ahern, R. G. and M. J. Brewer. 2002. Presence of two aphid parasitoids (Hymenoptera: Aphelinidae, Braconidae) in simple and diverse wheat production systems and adjacent grassland of the North American Great Plains. Agriculture, Ecosystems and Environment 92: 201-210.

Brewer, M. J., D. J. Nelson, R. G. Ahern, J. D. Donahue, and D. R. Prokrym. 2001. Recovery and range of expansion of parasitoids (Hymenoptera: Aphelinidae and Braconidae) released for biological control of Diuraphis noxia (Homoptera: Aphididae) in Wyoming. Environmental Entomology 30: 578-588.

Ahern, R. G. 2000. Conservation biological control through agroecosystem diversification: the interaction of Russian wheat aphid, hymenopteran parasitoids, and wheat production. M.S. thesis, University if Wyoming, Laramie, WY.

T. O. Crist and R. G. Ahern. 1999. Effect of habitat patch size and temperature on the distribution and abundance of ground beetles (Coleoptera: Carabidae) in an old field. Environmental Entomology 28:681-689.

 

Publications in Preparation

Ahern, R. G., D. J. Hawthorne, and M. J. Raupp. Phylogeography of a specialist insect, Adelges cooleyi (Hemiptera: Adelgidae): historical and contemporary processes shape the distribution of population genetic variation. In revision for resubmission to Molecular Ecology.

Ahern, R. G., D. J. Hawthorne, and M. J. Raupp. Distribution of genetic variation in a host-alternating insect pest, Adelges cooleyi (Hemiptera: Adelgidae), within and between primary and secondary hosts. In preparation for Molecular Ecology.

Ahern, R. G. and M. J. Raupp. Response of natural enemies to chemical control of elongate hemlock scale on eastern hemlock. In preparation Journal of Arboriculture and Urban Forestry.

Ahern, R. G., D. W. Schemske, A. A. Reznicek, and D. A. Landis. The distribution of nonindigenous plants in the landscape: the role of time, habitat, and biological traits. In preparation for Diversity and Distributions.

 

Non-refereed Publications

Raupp, M., R. Ahern, B. Onken, R. Reardon, S. Bealmear, J. Doccola, P. Wolf, P. Becker, T. McIntyre, K. Laskowski, and R. Webb. 2008. Comparing HWA and EHS control in ornamental and forest hemlocks. Proceedings of the 4th Hemlock Woolly Adelgid Symposium.

Ahern, R. G. and M. J. Raupp. 2005. Stepping up to the scale. Groundwork, October edition.

Ahern, R. G., M. J. Raupp, and S. R. Bealmear. 2004. Effects of systemic insecticides, a growth regulator, and oil on elongate hemlock scale and associated natural enemies on eastern hemlock. Proceedings, 3rd Symposium on Hemlock Woolly Adelgid in the Eastern United States.

Ahern, R., H. Lemke, K. Bejleri, and M. Raupp. 2004. Periodical cicada, information for landscape professionals and nurseries. Information sheet, Maryland Cooperative Extension.

Frank, S., R. Ahern, and M. Raupp. 2004. Periodical cicada, protecting susceptible trees with mesh netting. Information sheet, Maryland Cooperative Extension.