Iowa State University

College of Agriculture and Life Sciences

Henry A. Wallace Chair for Sustainable Agriculture


Weed Ecology and Management



Liebman, M., C.L. Mohler, C.P. Staver. 2001. Ecological management of agricultural weeds. Cambridge University Press, New York.

Extension Report

Weed Seed Predation in Agricultural Fields (PDF), Iowa State University Extension

Project Summaries

Weed Regulation by Granivorous Rodents, with Special Reference to Over-winter Weed Seed Mortality (PDF 686 KB)

Functional impacts of biodiversity: Indigenous mice and insects reduce weed population growth rates in low-external-input cropping systems (PDF 68 KB)

Seed predation contributes to the success of weed management in low-external-input cropping systems (PDF 72 KB)


Gómez, R., M. Liebman, D.N. Sundberg, and C.A. Chase. 2012. Comparison of crop management strategies involving crop genotype and weed management practices in conventional and more diverse cropping systems. Renewable Agriculture and Food Systems doi: 10.1017/S1742170512000142.

Liebman, M. and A.S. Davis. 2009. Managing weeds in organic farming systems: an ecological approach. Pages 173-196 in: C.A. Francis (ed.), Organic Farming: The Ecological System. American Society of Agronomy, Madison, WI. (See Front Pages)

Williams, C.L., M. Liebman, P.R. Westerman, J. Borza, D. Sundberg, and B. Danielson. 2009. Over-winter predation of Abutilon theophrasti and Setaria faberi seeds in arable land. Weed Research 49: 439-447. (See Summary) 

Westerman, Paula R., Dixon, P.M. & Liebman, M. (2009). Burial rates of surrogate seeds in arable fields. Weed Research 49, 142–152. (See Summary)

Westerman, Paula R., J.K. Borza, J. Andjelkovic, M. Liebman, and B. Danielson. 2008. Density-dependent predation of weed seeds in maize fields. Journal of Applied Ecology 45: 1612-1620.(See Summary)

Borza, J.K., P.R. Westerman, and M. Liebman. 2007. Comparing estimates of seed viability in three foxtail (Setaria) species using the imbibed seed crush test with and without additional tetrazolium testing. Weed Technology 21: 518-522.

Heggenstaller, A.H. and M. Liebman. 2006. Demography of Abutilon theophrasti and Setaria faberi in three crop rotation systems. Weed Research 46: 138-151. (See Abstract)

Heggenstaller, A.H., F.D. Menalled, M. Liebman, and P.R. Westerman.  2006. Seasonal patterns in post-dispersal seed predation of Abutilon theophrasti and Setaria faberi in three cropping systems. Journal of Applied Ecology 43: 999-1010.

Liebman, M. and D.N. Sundberg. 2006. Seed mass affects the susceptibility of weed and crop species to phytotoxins extracted from red clover shoots. Weed Science 54: 340-345.

O’Rourke, M.E., A. Heggenstaller, M. Liebman, M.E. Rice. 2006. Post-dispersal weed seed predation by invertebrates in conventional and low-external-input crop rotation systems. Agriculture, Ecosystems and Environment 116: 280-288. (See Abstract)

Westerman, P.R., M. Liebman, A.H. Heggenstaller, and F. Forcella. 2006. Integrating measurements of seed availability and removal to estimate weed seed losses due to predation. Weed Science 54: 566-574. (See Abstract)

Menalled, F.D., D.D. Buhler, and M. Liebman. 2005. Composted swine manure effects on germination and early growth of crop and weed species under greenhouse conditions. Weed Technology 19: 784-789. (See Abstract)

Menalled, F.D., K.A. Kohler, D.D. Buhler, and M. Liebman. 2005. Effects of composted swine manure on weed seedbank. Agriculture, Ecosystems, and Environment 111: 63-69. (See Abstract)

Westerman, P.R., M. Liebman, F.D. Menalled, A.H. Heggenstaller, R.G. Hartzler, and P.M. Dixon. 2005. Are many little hammers effective? Velvetleaf population dynamics in two- and four-year crop rotation systems. Weed Science 53: 382-392. (See Abstract)

Davis, A.S., P.M. Dixon, and M. Liebman. 2004. Using matrix models to determine croppping system effects on the demography of an annual weed. Ecological Applications 14: 655-668.

Duppong, L.M., K. Delate, M. Liebman, R. Horton, F. Romero, G. Kraus, J. Petrich, and P.K. Chowdbury. 2004. The effect of natural mulches on crop performance, weed suppression and biochemical constituents of catnip and St. John's wort. Crop Science 44: 861-869.

Gibson, L. and M. Liebman. 2004. A laboratory exercise for teaching depth of weed emergence concepts. Weed Technology 18: 473-479. (See Abstract)

Liebman, M., L. Bastiaans, and D.T. Baumann. 2004. Weed management in low-external-input and organic farming systems. Pages 285-315 in Inderjit (ed.), Weed Biology and Management, Kluwer Academic Publishers, Dordrecht, Netherlands.

Liebman, M. F.D. Menalled, D.D. Buhler, T.L. Richard, D.N. Sundberg, C.A. Cambardella, and K.A. Kohler. 2004. Impacts of composted swine manure on weed and corn nutrient uptake, growth, and seed production. Weed Science 52: 365-375.

Menalled, F.D., M. Liebman, and D.D. Buhler. 2004. Impact of composted swine manure and tillage on common waterhemp (Amaranthus rudis) competition with soybean. Weed Science 52: 605-613.

Davis, A.S., P.M. Dixon, and M. Liebman. 2003. Cropping system effects on giant foxtail demography: II. Retrospective perturbation analysis. Weed Science 51:930-939. (See Abstract)

Davis, A.S., and M. Liebman. 2003. Cropping system effects on giant foxtail demography: I. Green manure and tillage timing. Weed Science 51: 919-929. (See Abstract)

Davis, A.S. and M. Liebman. 2003. Cropping system effects on Setaria faberi seedbank dynamics. Aspects of Applied Biology 69: 93-91.

Gibson, L. and M. Liebman. 2003. A laboratory exercise for teaching critical period for weed control concepts. Weed Technology 17: 394-402.

Gibson, L. and M. Liebman. 2003. A laboratory exercise for teaching plant interference and relative growth rate concepts. Weed Technology 17: 403-411. (See Abstract)

Conklin, A.E., M.S. Erich, M. Liebman, D. Lambert, E. Gallandt, and W. A. Halteman. 2002. Effects of red clover (Trifolium pratense) green manure and compost soil amendments on the growth and health of wild mustard (Brassica kaber) seedlings. Plant and Soil 238: 245-256. (See Abstract)

Liebman, M. and E.R. Gallandt. 2002. Differential responses to red clover residue and ammonium nitrate fertilizer by common bean and wild mustard. Weed Science 50 521-529. (See Abstract)

Davis, A.S. and M. Liebman. 2001. Nitrogen source influences wild mustard growth and competitive effect on sweet corn. Weed Science 49: 558-566. (See Abstract)

Liebman, M. and A.S. Davis. 2000. Integration of soil, crop, and weed management in low-external-input farming systems.  Weed Research 40: 27-47. (See Abstract)

Return to Wallace Chair Projects

Giant Foxtail, Setaria faberi, in a field of clover. Seed production is one of the key processes regulating weed population dynamics. Photo courtesy of P.R. Westerman.


"Wise land use is simply an adaptation of nature's conservation and flood control methods to the conditions of advanced cultivation."
--H. A. Wallace

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