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Fritzi S. Grevstad

Fritzi Grevstad

Assistant Professor (Senior Research, Courtesy)
Ph.D., 1998, Cornell University


Office/Lab: 4063 Cordley Hall; 387 Richardson Hall Quarantine Facility

Phone: (541)-737-8371     

Research Area

Population ecology, invasive species ecology, plant-insect interactions, biological control of weeds.

Description of Research

I am interested in the population dynamics and interactions of plants and herbivorous insects, particularly as they relate to the biological control of weeds. My current research focuses on the development of safe and effective classical biocontrol programs for invasive knotweeds (Fallopia spp.) and gorse (Ulex europaeus). In the Richardson Hall Quarantine Facility at O.S.U., our team is studying several insect species collected from the native ranges of these plants to determine if they are sufficiently host-specific and effective to be used biological controls. Further research interests include the optimization of release strategies for biocontrol, patterns of establishment and invasion, and the effects of geographic displacement on insect-plant interactions.


Grevstad, F.S., C. O’Casey, and M.L. Katz.  2012.  A comparison of four geographic sources of the biocontrol agent Prokelisia marginata (Homoptera: Delphacidae) following introduction into a common environment.  Environmental Entomology 41: 448-454.

McIver, J. and F. Grevstad. 2010. Natural Enemies of Invasive Knotweeds in the Pacific Northwest. U.S.D.A. Forest Service Government Technical Publication.

Grevstad, F.S. 2006. Ten-year impacts of the biological control agents Galerucella pusilla and G. calmariensis (Coleoptera: Chrysomelidae) on purple loosestrife (Lythrum salicaria) in Central New York State. Biological Control 39: 1-8.

Grevstad, F.S. 2005. Strategies for controlling a spatially structured plant invasion: Spartina alterniflora in Pacific Coast estuaries. Biological Invasions 7: 665-677.

Taylor , C.M., H.G. Davis, J.C. Civille, F.S. Grevstad, and A. Hastings. 2004. Consequences of an Allee effect in the invasion of a Pacific Estuary by Spartina alterniflora. Ecological Applications 85: 3254-3266.

Grevstad, F.S. 2004. Prokelisia marginata and Spartina alterniflora. In: Coombs, E., Clark, J., Piper, G. and Cofrancesco, A. (eds) Biological Control of Invasive Plants of the United States. Western Soc. Weed Sci. OSU Press, Corvallis.

Grevstad, F.S., D.R. Strong, D. Garcia-Rossi, R.W. Switzer, and M.S. Wecker. 2003. Biological control of Spartina alterniflora in Willapa Bay, Washington using the planthopper Prokelisia marginata: agent specificity and early results. Biological Control 27: 32-42.

Grevstad, F. S. 1999. Experimental invasions using biological control introductions: the influence of release size on the chance of population establishment. Biological Invasions1: 313-323.

Grevstad, F. S. 1999. Factors influencing the chance of population establishment: implications for release strategies in biological control. Ecological Applications 9: 1439-1477.

Grevstad, F.S. and A.L. Herzig. 1997. Quantifying the effects of distance and conspecifics on colonization: experiments and models using the loosestrife leaf beetle, Galerucella calmariensis. Oecologia110: 60-68.

Grevstad, F.S. 1996. Establishment of weed control agents under the influences of demographic stochasticity, environmental variability, and Allee effects. In: Proceedings of the IX International Symposium on the Biological Control of Weeds. V.C. Moran and J.H. Hoffmann (eds). 19-26 January 1996, Stellenbosch, South Africa. University of Cape Town.

Morris, W.F., F.S. Grevstad, and A.L. Herzig. 1996. Mechanisms and ecological functions of spatial aggregation in chrysomelid beetles. In: Chrysomelidae Biology. Jolivet, P., M.I. Cox and T. Hsiao (eds.). SPB Academic Publishing, Amsterdam, The Netherlands.

Grevstad, F.S. and B.W. Klepetka. 1992. The influence of plant architecture on the foraging efficiencies of a suite of ladybird beetles feeding on aphids. Oecologia 92(3): 399-404.