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USDA / Agricultural Research Service |
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Invasive Weed Management Unit |
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Research Interests The goal of my research is optimization of integrated weed management systems by applying safe technologies within the framework of fundamental ecological principles. Study systems are defined by major vegetable and rotation crops, and the predominant weed species that invade these systems. In order to develop robust, inference-based weed management systems, knowledge on crop and weed dynamics is seminal. Due to limited basic information on weeds in vegetables, the initial approach is to quantify several aspects of crop/weed interactions. Results of field-based, multi-site interference studies are being used to parameterize deterministic models of crop/weed competition. These aid weed management decision making by identifying conditions when the crop is susceptible to losses in yield and quality, as well as implications to weed fitness. Furthermore, emerging biological, cultural, and chemical technologies are being examined for their potential role, individually and in a combined approach, in vegetable/rotation cropping systems.
Publications
Williams, M.M.II, A.S. Davis, T. Rabaey, C. Boerboom. 2009. Linkages among agronomic, environmental and weed management characteristics in North American sweet corn. Fields Crops Research. 113:161-169. Pataky, J.K, Williams, M.M.II, Riechers, D.E., and Meyer, M.D. A common genetic basis for cross-sensitivity to mesotrione and nicosulfuron in sweet corn hybrids and inbreds grown throughout North America. JASHS. 134:252-260. 2009.
Williams, M.M. II , T.L. Rabaey, and C.M. Boerboom. 2008. Residual weeds of processing sweet corn in the north central region. Weed Technology. 22:646-653. Williams, M.M. II . Sweet corn growth and yield responses to planting dates of the north central United States . 2008. HortScience. 43:1775-1779. Williams, M.M. II , L.M. Wax, J.K. Pataky, and M.D. Meyer. 2008. Further evidence of a genetic basis for varied levels of injury to sweet corn hybrids from cytochrome P450-metabolized herbicides applied postemergence. HortScience. 43:2093-2097. Pataky, J.K., M.D. Meyer, J.D. Bollman, C.M. Boerboom, and M.M. Williams II. 2008. Genetic basis for varied levels of injury to sweet corn hybrids from three cytochrome P-450 metabolized herbicides. Journal of the American Society for Horticultural Science 133(3): 438-447. Williams, M.M. II and J.K. Pataky. 2008. Genetic basis of sensitivity in sweet corn to tembotrione. Weed Science 56: 364-370.
Williams, M.M. II , R.A. Boydston., and A.S. Davis. 2008. Differential tolerance in sweet corn to wild-proso millet (Panicum miliaceum) interference. Weed Science 56:91-96. Williams, M.M. II , R.A. Boydston, and A.S. Davis. 2008. Crop competitive ability contributes to herbicide performance in sweet corn. Weed Research 48:58-67. Williams, M. M. II., R. A. Boydston and A. S. Davis . 2007. Wild proso millet (Panicum miliaceum) suppressive ability among three sweet corn hybrids. Weed Science 55: 245-251. Davis, A.S. and M.M. Williams II. 2007. Variation in wild proso millet fecundity in sweet corn has residual effects in snap bean. Weed Science 55:502–507.
Pataky, J.K., J.N. Nordby, M.M. Williams II, and D.E. Riechers. 2006. Inheritance of cross-sensitivity in sweet corn to herbicides applied postemergence. Journal of the American Society for Horticultural Science 131(6):744-751. Williams, M.M. II, J.K. Pataki, J.N. Nordby, D.E .Riechers, C.L. Sprague, and J.B. Masiunas. 2005. Cross-sensitivity in sweet corn to nicosulfuron and mesotrione applied postemergence. HortScience 40(6):1801-1805. Davis, Adam S., J. Cardina, F. Forcella, G.A. Johnson, G. Kegode, J.L. Lindquist, E.C. Luschei, K.A. Renner,C.L. Sprague, M.M. Williams II. 2005. Environmental factors affecting seed persistence of annual weeds across the U.S. corn belt. Weed Sci. 53:860-868.
Williams, M.M. II, D.B. Walsh, and R.A. Boydston. 2004. Integrating arthropod herbivory and reduced herbicide use for weed management. Weed Science 52:1018-1025.
Williams, M.M. II, C.V. Ransom, and W.M. Thompson. 2004. Effect of volunteer potato density on dry bulb onion yield and quality. Weed Science 52:754-758.
Boydston, R.A. and M.M. Williams II. 2004. Combined effects of Aceria malherbae and herbicides on field bindweed growth. Weed Science 52:297-301.
Dille, J.A., M. Milner, J. Groeteke, D.A. Mortensen, and M.M. Williams II. 2003. How good is your weed map? A comparison of spatial interpolators. Weed Science 51:44-55.
Boydston, R.A. and M.M. Williams II. 2003. Effect of soil fumigation on volunteer potato (Solanum tuberosum) tuber viability. Weed Technology 17:352-357.
Williams, M.M. II and R.A. Boydston. 2002. Effect of shoot removal during tuberization on volunteer potato (Solanum tuberosum) tuber production. Weed Technology 16:617-619.
Williams, M.M. II, D.A.Mortensen, W.J. Waltman, and A.R. Martin. 2002. Spatial inference of herbicide bioavailability using a geographic information system. Weed Technology 16:603-611.
Gerhards, R.,M. Sökefeld, C. Timmermann, W. Kübauch, and M.M. Williams II. 2002. Site-specific weed control in maize, sugar beet, winter wheat and winter barley. Precision Agriculture 3:25-35.
Williams, M.M. II, D.A. Mortensen, A.R. Martin, and D.B. Marx. 2001. Within-field soil heterogeneity effects on herbicide-mediated crop injury and weed biomass. Weed Science 49:798-805.
Williams, M.M. II and D.A. Mortensen. 2001. Crop/weed outcomes from site-specific and uniform soil-applied herbicide applications. Precision Agriculture 2:377-388.
Williams, M.M. II, R. Gerhards, and D.A. Mortensen. 2001. Two-year weed seedling population responses to a postemergent method of site-specific weed management. Precision Agriculture 2:247-263.
Williams, M.M. II, D.A. Mortensen, and J.W. Doran. 2000. No-tillage soybean performance in cover crops for weed management in the western cornbelt. Journal of Soil and Water Conservation 55:79-84.
Williams, M.M. II, R. Gerhards, and D.A. Mortensen. 1999. Spatiotemporal outcomes of site-specific weed management in maize. Pages 897-906. in J.V. Stafford, ed. Precision Agriculture ’99. Sheffield, United Kingdom: Sheffield Academic Press.
Gerhards, R., M. Sökefeld, C. Timmermann, S. Reichart, W. Kühbauch, and M.M. Williams II. 1999. Results of a 4-year study on site-specific herbicide application. Pages 689-697. in J.V. Stafford, ed. Precision Agriculture ’99. Sheffield, United Kingdom: Sheffield Academic Press.
Williams, M.M. II, D.A. Mortensen, and J.W. Doran. 1998. Assessment of weed and crop fitness in cover crop residues for integrated weed management. Weed Science 46:595-603.
Williams, M.M. II, J. Jordan, and C. Yerkes. 1995. The fitness cost of triazine resistance in Jimsonweed (Datura stramonium L.). American Midland Naturalist 133:131-137. |
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