Dr. Greg Johnson

Professor Veterinary Entomology Dept. of Animal and Range Sciences MSU-Bozeman Bozeman, MT 59717 phone (406) 994-3875 fax (406) 994-5589 gdj@montana.edu Education Ph.D. University of Wyoming, 1978 M.S. University of Wyoming, 1975 B.S. Eastern Mennonite University, 1970
Classes ARNR 410, Veterinary Entomology	Greg Johnson and Kristina Hale, graduate student, bleed a sentinel chicken for West Nile virus surveillance at Medicine Lake National Wildlife Refuge.

Research Interests

• Research in my laboratory focuses on the biology, ecology and management of arthropod pests that attack livestock and wildlife.  Field and laboratory studies have been conducted on West Nile virus determining vector distribution in the state, identifying enzootic and epizootic zones of virus transmission and studying the impact of WNV on sage grouse in the Powder River Basin, WY and American white pelicans in northeast MT.  Research has also been conducted on biting midges (Culicoides) and bluetongue virus focusing on vector competency and midge distribution in the state.  Currently, research is being conducted by Kristina Hale, a Ph.D. student in my lab, on the ecology of stable flies, Stomoxys calcitrans, in a prairie wetland habitat.  I also conduct studies on management of different livestock pests that cause direct losses and affect livestock production.   Included in this group are cattle grubs, horn flies, sheep keds and the African blue louse.

Completed Graduate Students

• Hale, K. M.  2007.  Investigations of the West Nile Transmission Cycle at Medicine Lake National Wildlife Refuge, Montana 2005-2006.  Montana State University.  MS Thesis.  74p.

• Doherty, M. K.  2007.  Mosquito Populations in the Powder River Basin, Wyoming: A Comparison of Natural, Agricultural and Effluent Coal Be Natural Gas Aquatic Habitats.  Montana State University.  MS Thesis.  95p.

Extension Programs

• Pesticide Applicator Program - involves education and training of Montana's 8,000 farmers and ranchers who need a license to purchase and apply restricted use pesticides. To facilitate implementation of this program county Extension agents and specialists are involved to provide up-to-date information on various aspects of the selection and use of pesticides for the myriad pests that attack crop and range.
• Pesticide Impact Assessment Program - this program acquires data on pesticide usage in Montana and determines which pesticides are important for protecting, crop, range, and livestock. Pesticide use surveys have been conducted on a number of commodities inthe state and these data are used to support registrations of these pesticides.

Recent Publications

• Johnson, G., N. Nemeth, K. Hale, N. Lindsey, N. Panella, and N. Komar. American White Pelican (Pelecanus erythrorhynchos) Mortality Surveillance for West Nile Virus: Potential Application to Public Health. Emerging Infectious Diseases. Submitted.
• Miller, M. J. Brown, T. Cornish, G. Johnson, J. Mecham, and W. Reeves and W. Wilson. Investigation of an Epizootic of Bluetongue Virus 1 Serotype 17 in Sheep in Wyoming. J. Am. Vet. Med. Assoc. Submitted.
• Kato, C.Y., E.T. Schmidtmann, A.W. Fabian, G.D. Johnson, D.E. Naugle, D.E. Legg, and R.T. Mayer. Cytochrome b analyses of mosquito blood meals: identifying wildlife hosts of West Nile virus mosquito vectors in Wyoming, USA. J. Wildlife Diseases. In review.
• Johnson, G. 2009. Horn flies on cattle: biology and management. MontGuide MT 200912AG.
• Johnson, G. 2009. Ticks of veterinary and public health importance in Montana. MSU Ext. Bulletin. In press.
• Lloyd, J.E., G.D. Johnson, R.W, Kott, H.B. Goosey and D.E. Legg, 2007. Clean-Up™ Pour-On Insecticide With Igr To Control Sheep Ked. Arthropod Management Tests 32:k1.
• Johnson, G.D., 2007. Cutworms. In Handbook of Small Grain Insects. G.D. Buntin, K.S. Pike, M J. Weiss and J.A. Webster eds. APS Press. P 53-55.
• Lenssen, A.W., G.D. Johnson, S.L. Blodgett and H.B. Goosey, 2007. Influence of tillage system, oilseed species, and insecticidal seed treatment on flea beetle (Coleoptera: Chrysomelidae) damage, oilseed production, and postharvest residue cover. J. Entomol. Sci. 42:1-10.
• Lenssen, A.W., G.D. Johnson and G.R. Carlson, 2007. Cropping sequence and tillage system influences annual crop production and water use in semiarid Montana, USA. Field Crops Res. 100:32-43.
• Lenssen, A.W., J.T. Waddell, G.D. Johnson and G.R. Carlson, 2007. Diversified cropping systems in semiarid Montana: Nitrogen use during drought. Soil and Tillage Res. 94:362-375.
• Chen, C., G. Jackson, K. Neill, D. Wichman, G. Johnson, and D. Johnson. 2005. Determining the feasibility of early seeding canola in the Northern Great Plains. Agron. J. 97: 1252-1262.
• Naugle, D.E., C. L. Aldridge, B. L. Walker, B.J. Moynahan, M.J. Holloran, K. Brown, G. D. Johnson, E.T. Schmidtmann… 2004. West Nile virus: pending crisis for greater sage grouse. Ecology Letters. 7: 704-713.

Return to regular view	Text-only	Updated: 09/22/2009