Weed science & crop physiology; herbicide selectivity, action & metabolism in crops and weeds. Fate of herbicides in soils.
Ph.D. in Plant Physiology (Weed Science), University of California-Davis
M.S. in Plant Physiology, University of Minnesota
B.S. in Agriculture Education, University of Minnesota
Herbicide action, metabolism, and selectivity.
Herbicide resistance in weeds and crops.
Fate of herbicides in plants and soils.
Penner, D. and J. Michael. 2010. The effect of pH on glyphosate activity and water conditioning. JAI 7:JAI102770 pp. 1-6.
Poling, K.W., K.A. Renner, and D. Penner. 2009. Dry edible bean (Phaseolus vulgaris) class and cultivar response to dimethenamid and metolachlor. Weed Technol. 23:73-80.
Bernards, M.L., D. Penner and J. Michael. 2009. Imazapyr absorption and translocation in Northern red oak and red maple as affected by herbicide formulation and adjuvant methylated seed oil. JAI 6:1-10.
Simarmata, M. and D. Penner. 2008. The basis for glyphosate resistance in rigid ryegrass (Lolium rigidum) from California. Weed Sci. 56:181-188.
Coleman, R. and D. Penner. 2008. Organic acid enhancement of pelargonic acid. Weed Technol. 22:38-41.
Nelson, E. A. and D. Penner. 2007. Leaching of isoxaflutole and the herbicide safeners R-29148 and furilazole. Weed Technol. 21:106-109.
Bernards, M.L., K.D. Thelen, D. Penner, R.B. Muthukumaran, and J.L. McCracken. 2005. Glyphosate interaction in tank-mixture with manganese and its effect on glyphosate absorption and translocation. Weed Sci 53:787-794.
Lee, C.D., K.A. Renner, D. Penner, R. Hammerschmidt, and J.D. Kelly. 2005. Glyphosate-resistant soybean management systems effect on Sclerotinia stem rot. Weed Technol. 19:580-588.
Nelson, E.A. and D. Penner. 2005. Sensitivity of selected crops to isoxaflutole in soil and irrigation water. Weed Technol. 19:659-663.
Penner, D. J. Michael, and W.G. Brown. 2005. A novel water conditioning adjuvant for use with formulated and nonformulated glyphosate. Pesticide Formulation and Application Systems: Twenty Fourth Volume, ASTM STP 1460, H.B. Lopez and G.C. Volgas, Eds., ASTM International, West Conshohocken, PA, pp. 128-133.
Aichele, T. and D. Penner. 2005. Adsorption, desorption, and degradation of imidazolinones in soil. Weed Technol. 19:154-159.
Bernards, M.L., K.D. Thelen, and D. Penner. 2005. Glyphosate efficacy is antagonized by manganese. Weed Technol.19:27-54.
Simarmata, M., S. Bughrara, and D. Penner. 2005. Inheritance of glyphosate resistance in rigid ryegrass (Lolium rigidum Gaud.) from California. Weed Sci. 53:615-619.
Penner, D., J. Michael, and W.G. Brown. 2005. A novel water conditioning adjuvant for use with formulated and nonformulated glyphosate. www.astm.org.:JAI 12157, 2:1-6.
Lee, C.D., D. Penner, and R. Hammerschmidt. 2003. Glyphosate and shade effects on glyphosate-resistant soybean defense response to Sclerotinia sclerotiorum. Weed Sci. 51:294-298.
Penner, D., J. Michael, W. G. Brown, and P. Sikkema. 2003. Biologically active in-tank formulation of acid herbicides. Pesticide Formulations and Application Systems: 23rd International Symposium, ASTM STP 1449, G. Volgas, R. Downer, and H. Lopez, Eds., ASTM International, West Conshohocken, PA, p. 158-167.
Pratt, D., D. Penner, and J.J. Kells. 2003. Substitutes for ammonium sulfate as additives with glyphosate and glufosinate. Weed Technol. 17:576-581.
Simarmata, M., J.E. Kaufmann, and D. Penner. 2003. Potential basis of glyphosate resistance in California rigid ryegrass (Lolium rigidum Gaud.), Weed Sci.. 51:678-682.