De Clerck-Floate, Rosemarie, Ph.D.

Research Scientist

Contact Information:

5403 - 1 Avenue South
PO Box 3000
Lethbridge, Alberta T1J 4B1
Telephone: 403-317-2270
Fax: 403-382-3156

Areas of Expertise:

  • biocontrol of invasive alien plants
  • weed biology and ecology
  • insect-plant interactions
  • insect ecology
  • interactions between weed biocontrol agents and non-target plant species
  • rangeland management
  • mass-propagation of insect biocontrol agents
  • insect rearing
  • integrated pest management
  • weed biological control
  • design and operation of insect containment facilities

Current Projects:

  • Discover, develop and implement arthropod agents for biological control of weeds.
  • The use of fertilization to improve the delivery, reliability, and study of weed biological control.
  • Interactions of biocontrol insect, target weed and non-target, native plant populations on rangelands.


  • Adjunct Professor, University of Lethbridge, Department of Biological Sciences
  • Adjunct Professor, University of British Columbia, Okanagan, Irving K. Barber School of Arts and Science
  • Associate Editor, Weed Biocontrol Section, Environmental Entomology
  • Vice President, Entomological Society of Alberta

Research Publications:

The links below lead to abstracts with access to full text.



  • De Clerck-Floate, R.A. and Cárcamo, H.A. (2011). "Biocontrol arthropods: new denizens of Canada's grassland agroecosystems.", in Floate, K.D. (ed.) - Arthropods of Canadian Grasslands. Vol. 2: Inhabitants of a Changing Landscape, Biological Survey of Canada (BSC), Chapter 12, pp. 291-321.
  • Gaskin, J.F., Bon, M.-C., Cock, M.J.W., Cristofaro, M., De Biase, A., De Clerck-Floate, R.A., Ellison, C.A., Hinz, H.L., Hufbauer, R.A., Julien, M.H., and Sforza, R. (2011). "Applying molecular-based approaches to classical biological control of weeds (Review).", Biological Control, 58(1), pp. 1-21. doi : 10.1016/j.biocontrol.2011.03.015



Other Science Related Publications:


  • Catton, H.A., De Clerck-Floate, R.A., and Lalonde, R.G. (2012). "Houndstongue, biocontrol and nontarget attack.", South Okanagan-Similkameen Invasive Plant Society (SOSIPS) Annual General Meeting, Penticton, BC, Canada, April 10, 2012. (Abstract)
  • Catton, H.A., Lalonde, R.G., and De Clerck-Floate, R.A. (2012). "Patch-level nontarget attack by the biocontrol weevil Mogulones crucifer: A temporary spillover effect requiring host plant presence?", Ecological Society of America (ESA 2012) 97th Annual Meeting, Portland, OR, USA, August 5-10, 2012. (Abstract)
  • De Clerck-Floate, R.A. and Bourchier, R.S. (2012). "Classical weed biocontrol in Canada: How do new agents against emerging invasive plants happen?", Terrestrial Invasive Plant Species Conference: Understanding Plant Invasions in a Changing World, Sault Ste. Marie, ON, Canada, August 20-22, 2012, pp. 40. (Abstract)
  • De Clerck-Floate, R.A. and Dyck, J. (2012). "Developing a biological control strategy for hawkweeds in Canada.", Entomological Society of Canada 62nd and Entomological Society of Alberta 60th joint Annual Meeting, Coast Edmonton Plaza Hotel, Edmonton, AB, Canada, November 4-7, 2012. (Poster)
  • De Clerck-Floate, R.A., Gassmann, A., Sing, S., and Tŏsevski, I. (2012). Petition for field release of Rhinusa pilosa (Gyllenhal, 1838) (Coleoptera: Curculionidae) against yellow toadflax (Linaria vulgaris Mill.: Plantaginaceae) in Canada and the U.S.A. March 19, 2012, 93 pp. (Report)


  • De Clerck-Floate, R.A., Bourchier, R.S., and Van Hezewijk, B.H. (2009). "What’s happening up north on weed biocontrol research?", Interagency Biological Control Meeting, Billings, MT, USA, November 16-17, 2009. (Presentation)
  • De Clerck-Floate, R.A., Floate, K.D., and Saunders, P. (2009). "A test of containment efficacy using living insects in a release and recapture study.", Entomological Society of Alberta 57th Annual Meeting, Lakeland College, Vermilion, AB, Canada, November 5-7, 2009, pp. 21.
  • De Clerck-Floate, R.A., Floate, K.D., and Saunders, P. (2009). "A test of containment efficacy using living insects in a release and recapture study.", Entomological Society of Canada 59th and Manitoba Entomological Society Joint Annual Meeting, Winnipeg, MB, Canada, October 18-21, 2009, pp. 46.