Peter Sikkema

Peter Sikkema
Professor

Email:

Phone:

(519) 674-1500 x63603

Fax:

(519) 674-1600

Education:

B.Sc. University of Guelph;
M.Sc. University of Guelph;
Ph.D. University of Guelph

Location:

Ridgetown Campus

Room:

132 RIDG

My research program focuses on the development of precision weed management programs in corn, soybean, edible bean and cereals to improve the level of weed control, reduce crop injury, increase crop yield and maximize net returns to Ontario producers. Recent or current projects include:

  • Crop tolerance and weed management in corn, soybean, edible beans and cereals
  • Integrated weed management in edible beans
  • Effect of time of day on herbicide performance
  • Benefits of residual herbicides in Roundup Ready crops
  • Control of problem weeds in corn, soybean and wheat

Courses:

PLNT*6210 Herbicide Activity
PLNT*6800 Special Topics in Plant Science (Herbicide Activity)

Relevant Links:

Selected Publications:

Soltani, Nader, Christy Shropshire and Peter H. Sikkema. (2017). Sensitivity of adzuki bean (Vigna angularis) to acifluorfen, fomesafen, bentazon, imazethapyr and halosulfuron-methyl applied postemergence. American Journal of Plant Sciences. 8: 1092-1099.

Mahoney, Kris, J. Christy Shropshire  and Peter H. Sikkema. (2017). Postemergence herbicides for controlling glyphosate-resistant Canada fleabane in corn. Canadian Journal of Plant Science. 97: 206-209.

Budd, Christopher M., Nader Soltani, Darren E. Robinson, David C. Hooker, Robert T. Miller and Peter H. Sikkema. (2017). Efficacy of saflufenacil for control of glyphosate-resistant Canada fleabane [Conyza canadensis (L.) Cronq.] as affected by height, density and time of day. Weed Science. 65: 275-284.

Soltani, Nader, Anita J. Dille, Ian C. Burke, Wesley J. Everman, Mark J. VanGessel, Vince M. David and Peter H. Sikkema. (2017). Perspectives on soybean yield losses due to weeds in North America. Weed Technology. 31: 148-154.

Taziar, Allison N., Nader Soltani, Christy Shropshire, Darren E. Robinson, Mitch Long, Chris L. Gillard and Peter H. Sikkema. (2017). Sulfentrazone plus a low rate of halosulfuron for weed control in white bean (Phaseolus vulgaris L.). Agricultural Sciences. 8: 227-238.

Li, Zhenyi, Rene Van Acker, Nader Soltani and Peter H. Sikkema. (2017). Direct versus indirect herbicide effects: the example of preplant incorporated halosulfuron. American Journal of Plant Sciences. 8: 645-650.

Soltani, Nader, Christy Shropshire and Peter H. Sikkema. (2017). Sensitivity of field corn to halosulfuron applied preemergence and postemergence. Canadian Journal of Plant Science. 97: 6-9.

Soltani, Nader, Anita J. Dille, Ian C. Burke, Wesley J. Everman, Mark J. VanGessel, Vince M. Davis and Peter H. Sikkema. (2016). Potential corn yield losses from weeds in North America. Weed Technology. 30: 979-984.

Taziar, Allison N., Nader Soltani, Christy Shropshire, Darren E. Robinson, Mitch Long, Chris L. Gillard and Peter H. Sikkema. (2016). Tolerance of four dry bean market classes to pre-emergence applications of sulfentrazone. American Journal of Plant Sciences. 7: 2248-2256.  

Taziar, Allison N., Christy Shropshire, Darren E. Robinson, Mitch Long, Chris L. Gillard, Nader Soltani and Peter H. Sikkema. (2016). Sulfentrazone tank mix partners for weed control in white bean (Phaseolus vulgaris L.). Canadian Journal of Plant Science. 96: 1037-1044.

Budd, Christopher M, Nader Soltani, Darren E. Robinson, David C. Hooker, Robert T. Miller and Peter H. Sikkema. (2016). Control of glyphosate resistant Canada fleabane with saflufenacil plus tankmix partners in soybean. Canadian Journal of Plant Science. 96: 989-994.

Brown, Lynette, R., Christy Shropshire and Peter H. Sikkema. (2016). Control of glyphosate-resistant Canada fleabane in corn with preplant herbicides. Canadian Journal of Plant Science. 96: 932-934.

Soltani, Nader, Robert E. Nurse, Christy Shropshire and Peter H. Sikkema. (2016). Benefit of adding ammonium sulfate or additional glyphosate to glyphosate in corn and soybean. Agricultural Science. 7: 759-770.

Soltani, Nader, Christy Shropshire and Peter H. Sikkema. (2016). Winter wheat (Triticum aestivum) response to flumioxazin residues from preceding dry bean (Phaseolus vulgaris) desiccation. Canadian Journal of Plant Science. 96: 790-795.

Belfry, Kimberly D., Michael J. Cowbrough, Francois J. Tardif and Peter H. Sikkema. (2016). Weed management options for conventional soybean. Canadian Journal of Plant Science. 96: 743-747.

Soltani, Nader, Robert E. Nurse and Peter H. Sikkema. (2016). Glyphosate resistant soybean injury from 2,4-D spray tank contamination. Canadian Journal of Plant Science. 96: 734-742.

Budd, Christopher M., Nader Soltani, Darren E. Robinson, David C. Hooker, Robert T. Miller and Peter H. Sikkema. (2016). Glyphosate resistant Horseweed Dose response to saflufenacil, saflufenacil plus glyphosate, and metribuzin plus saflufenacil plus glyphosate in soybean. Weed Science. 64: 727-734.

Li, Zhenyi, Kallie C. Kessler, Marcelo Rodrigues Alves de Figueiredo, Scott J. Nissen, Todd A. Gaines, Philip Westra, Rene Van Acker, J. Christopher Hall, Darren E. Robinson, Nader Soltani and Peter H. Sikkema. (2016). Halosulfuron absorption, translocation and metabolism in white and adzuki bean. Weed Science. 64: 705-711.

Underwood, Matthew G. Nader Soltani, David C. Hooker, Darren E. Robinson, Joseph P. Vink, Clarence J. Swanton and Peter H. Sikkema. (2016). The addition of dicamba to POST applications of quizalofop-p-ethyl or clethodim antagonizes volunteer glyphosate-resistant corn control in dicamba-resistant soybean. Weed Technology. 30: 639-647.

Soltani, Nader, Christy Shropshire and Peter H. Sikkema. (2016). Effect of biostimulants added to postemergence herbicides in soybean. American Journal of Plant Science. 7: 1729-1740.

Mahoney, Kris, J. Kristen E. McNaughton and Peter H. Sikkema. (2016). Herbicide tank mixtures to control co-existing glyphosate-resistant Canada fleabane and giant ragweed in soybean. Canadian Journal of Plant Science. 96: 657-661.

Taziar, Allison N., Nader Soltani, Christy Shropshire, Darren E. Robinson, Mitch Long, Chris L. Gillard and Peter H. Sikkema. (2016). Weed control with sulfentrazone plus a low rate of imazethapyr in white bean (Phaseolus vulgaris L.). Agricultural Sciences. 7: 447-456.

Taziar, Allison N., Nader Soltani, Christy Shropshire, Darren E. Robinson, Mitch Long, Chris L. Gillard and Peter H. Sikkema. (2016). Response of four dry bean market classes to pre-emergence applications of pyroxasulfone, sulfentrazone and pyroxasulfone + sulfentrazone. American Journal of Plant Sciences. 7: 1217-1225.  

Soltani, Nader, Robert E. Nurse and Peter H. Sikkema. (2016). Biologically effective rate of glyphosate as influenced by weed size in corn. Canadian Journal of Plant Science. 96: 455-460.

Ditschun, Scott, Nader Soltani, Darren E. Robinson, Francois J. Tardif, Allan C. Kaastra and Peter H. Sikkema. (2016). Control of glyphosate-resistant giant ragweed (Ambrosia trifida L.) with isoxaflutole and metribuzin tank-mix. American Journal of Plant Science. 7: 916-927.

Baute, Kurtis A., Darren E. Robinson, Laura L. Van Eerd, Michael Edson, Peter H. Sikkema and Brandon H. Gilroyed. (2016). Survival of seeds from perennial biomass species during commercial-scale anaerobic digestion. Weed Research. DOI: 10.1111/wre.12202.

Li, Zhenyi, Rene Van Acker, Darren E. Robinson, Nader Soltani and Peter H. Sikkema. (2016). Halosulfuron tankmixes applied preplant incorporated for weed control in white bean. Canadian Journal of Plant Science. 96: 81-88.

Ditschun, Scott, Nader Soltani, Darren E. Robinson, Francois J. Tardif, Allan C. Kaastra and Peter H. Sikkema. (2016). Control of glyphosate-resistant Canada fleabane (Conyza canadensis (L.) Cronq.) with isoxaflutole and metribuzin tankmix. Canadian Journal of Plant Science. 96: 72-80.

Mahoney, Kris, J. Christy Shropshire  and Peter H. Sikkema. (2016). Examining the plant-back interval for glyphosate/glufosinate resistant corn after ACCase inhibitors application. Canadian Journal of Plant Science. 96 :6-10.

Soltani, Nader, Robert E. Nurse and Peter H. Sikkema. (2016). Response of glyphosate-resistant soybean to dicamba spray tank contamination during vegetative and reproductive growth stages. Canadian Journal of Plant Science. 96: 160-164.

Mahoney, Kris, J. Kristen E. McNaughton  and Peter H. Sikkema. (2016). Control of glyphosate-resistant horseweed in winter wheat with pyrasulfotole premixed with bromoxynil. Weed Technology. 30: 291-296.

Belfry, Kimberly D., Christy Shropshire and Peter H. Sikkema. (2016). Identity-preserved soybean tolerance to protoporphyrinogen oxidase-inhibiting herbicides. Weed Technology. 37: 137-147.

Li, Zhenyi, Rene Van Acker, Darren E. Robinson, Nader Soltani and Peter H. Sikkema. (2016). Halosulfuron tankmixes applied PRE in white bean. Weed Technology. 30: 57-66.

Soltani, Nader, Christy Shropshire and Peter H. Sikkema. (2016). Influence of herbicide carrier on the tolerance of white bean to preplant incorporated and preemergence herbicides. American Journal of Plant Sciences. 7: 63-68.

Soltani, Nader, Christy Shropshire and Peter H. Sikkema. (2015). Responses of winter wheat to herbicide-fungicide tankmixes. Agricultural Sciences. 6: 1352-1356.

Mahoney, Kris, J. Kristen E. McNaughton  and Peter H. Sikkema. (2015). Control of glyphosate-resistant giant ragweed in winter wheat. Weed Technology. 29: 868-873. 

McNaughton, K. E., Robert E. Blackshaw, Kristine A. Waddell, Robert H. Gulden, Peter H. Sikkema and Chris L. Gillard. (2015). Effect of five desiccants applied alone and in combination with glyphosate in dry edible bean (Phaseolus vulgaris L.). Canadian Journal of Plant Science. 95: 1235-1242.

Belfry, Kimberly D., Kristen E. McNaughton and Peter H. Sikkema. (2015). Weed control in soybean using pyroxasulfone plus sulfentrazone. Canadian Journal of Plant Science. 95: 1199-1204.

Soltani, Nader, Christy Shropshire and Peter H. Sikkema. (2015). Responses of dry bean to biostimulants added to postemergence herbicides. Agricultural Sciences. 6: 1023-1032.

Soltani, Nader, Kristen E. McNaughton and Peter H. Sikkema. (2015). Field horsetail (Equisetem arvense L.) control in corn. Canadian Journal of Plant Science. 95: 983-986.

Soltani, Nader, Robert E. Nurse, Christy Shropshire and Peter H. Sikkema. (2015). Tolerance of adzuki beans to pre-emergence herbicides. Canadian Journal of Plant Science. 95: 959-963.

Van Wely, Annemarie, Nader Soltani, Darren E. Robinson, David C. Hooker. Mark B. Lawton and Peter H. Sikkema. (2015). Glyphosate resistant common ragweed (Ambrosia artemisiifolia L.) control with postemergence herbicides and glyphosate dose response in soybean in Ontario. Weed Technology. 29: 380-389.

Soltani, Nader, Christy Shropshire and Peter H. Sikkema. (2015). Control of volunteer corn with the AAD-1 (aryloxyalkanoate dioxygenase-1) transgene in soybean. Weed Technology. 29: 374-379.

Soltani, Nader, Kristen E. McNaughton,. Chris L. Gillard, Robert E. Nurse  and Peter H. Sikkema. (2015). Tolerance of glyphosate-resistant maize to glyphosate plus MCPA is influenced by dose and timing. Advances in Agriculture. Volume 2015. Article ID 968050, 5 pages.

Soltani, Nader, Lynette R. Brown, Christy Shropshire and Peter H. Sikkema. (2015). Weed control in winter wheat (Triticum aestivum L.) with preplant applications of glyphosate plus mesotrione or saflufenacil. Agricultural Sciences. 6: 594-600.

Soltani, Nader, Darren E. Robinson, Robert T. Miller and Peter H. Sikkema. (2015). Length of residual activity of saflufenacil/dimethenamid-p in soybean (Glycine max). Canadian Journal of Plant Science. 95: 727-733.

Belfry, Kimberly D., Nader Soltani, Lynette R. Brown and Peter H. Sikkema. (2015). Tolerance of identity preserved soybean cultivars to preemergence herbicides. Canadian Journal of Plant Science. 95: 719-726.

Soltani, Nader, Christy Shropshire and Peter H. Sikkema. (2015). Effect of biostimulants added to postemergence herbicides in corn, oats and winter wheat. Agricultural Sciences. 6: 527-534.

Yu, Li, Peter H. Sikkema, Laura L. Van Eerd, Ivan O’Halloran and Darren E. Robinson. (2015). Response of four fall-seeded cover crops to residues of selected herbicides. Crop Protection. 75: 11-17.

McNaughton, K. E., Robert E. Blackshaw, Kristine A. Waddell, Robert H. Gulden, Peter H. Sikkema and Chris L. Gillard. (2015). Effect of application timing of glyphosate and saflufenacil as desiccants in dry edible bean (Phaseolus vulgaris L.). Canadian Journal of Plant Science. 95: 369-375.

Walsh, Kimberly D., Nader Soltani, David C. Hooker, Robert E. Nurse and Peter H. Sikkema. (2015). Biologically effective rate of sulfentrazone applied pre-emergence in soybean. Canadian Journal of Plant Science. 95: 339-344.

Van Wely, Annemarie, C., Nader Soltani, Darren E. Robinson, David C. Hooker. Mark B.Lawton and Peter H. Sikkema. (2015). Glyphosate and acetolactate synthase resistant common ragweed (Ambrosia artemisiifolia L.) in southwestern Ontario. Canadian Journal of Plant Science. 95: 335-338.

Robinson, Melody A., Jocelyne Letarte, Michael J. Cowbrough, Peter H. Sikkema and Francois J. Tardif. (2015). Winter wheat (Triticum aestivum L.) response to herbicides as affected by application timing and temperature. Canadian Journal of Plant Science. 95: 325-333.

Yu, Li, Laura L. Van Eerd, Ivan O’Halloran, Peter H. Sikkema and Darren E. Robinson. (2015). Response of four spring-seeded cover crops to residues of selected herbicides. Canadian Journal of Plant Science. 95: 303-313.

Belfry, Kimberly D., Christ Shropshire and Peter H. Sikkema. (2015). Evaluation of delayed glyphosate burndown in no-till soybean. Agricultural Sciences. 6: 346-351.

Soltani, Nader, Christy Shropshire and Peter H. Sikkema. (2015). Response of four market classes of dry beans to halosulfuron applied postemergence at five application timings. Agricultural Sciences. 6: 247-255.

Belfry, Kimberly D. and Peter H. Sikkema. (2015). Preplant and postemergence control of glyphosate-resistant giant ragweed (Ambrosia trifida L.) in corn (Zea mays L.). Agricultural Sciences. 6: 256-262.

Walsh, Kimberly D., Nader Soltani, Christy Shropshire and Peter H. Sikkema. (2015). Weed control in soybean with imazethapyr applied alone or in a tank mx with saflufenacil/dimethenamid-p. Weed Science. 63: 329-335.

Belfry, Kimberly D. and Peter H. Sikkema. (2015). Response of four types of winter wheat to fenoxaprop-p-ethyl. American Journal of Plant Sciences. 6: 195-200.

Soltani, Nader, Christy Shropshire and Peter H. Sikkema. (2015). Pendimethalin residues from weed management in dry bean can cause injury in autumn seeded winter wheat. Agricultural Sciences. 6: 159-163.

Van Wely, Annemarie, Nader Soltani, Darren E. Robinson, David C. Hooker. Mark B. Lawton and Peter H. Sikkema. (2014). Control of glyphosate and acetolactate synthase resistant common ragweed (Ambrosia artemisiifolia L.) in soybean (Glycine max L.) with preplant herbicides. American Journal of Plant Sciences. 5: 3934-3942.

Robinson, Melody, Jocelyne Letarte, Mike Cowbrough, Peter H. Sikkema and Francois J. Tardif. (2014). Response of underseeded red clover (Trifolium pretense L.) to winter wheat (Triticum aestivum L.) herbicides as affected by application timing. Agricultural Sciences. 5: 1351-1360.

Mahoney, Kris, J. Christy Shropshire  and Peter H. Sikkema. (2014). Comparison of glyphosate formulations for weed control and tolerance in maize (Zea mays L.) and soybean [Glycine max (L.) Merr.]. Agricultural Sciences. 5: 1329-1337.

Soltani, Nader, Christy Shropshire and Peter H. Sikkema. (2014). Sensitivity of dry bean to dimethenamid-p, saflufenacil and dimethenamid-p/saflufenacil. American Journal of Plant Sciences. 5: 3288-3294.

Soltani, Nader, Robert E. Nurse, Christy Shropshire and Peter H. Sikkema. (2014). Weed control in white bean with various halosulfuron tankmixes. Advances in Agriculture. (2014). Article ID 391634. 7 pages. DOI: 10.1155/2014/391634.

Mahoney, Kris, J. Robert E. Nurse and Peter H. Sikkema. (2014). The effect of hard water and ammonium sulfate on glyphosate efficacy and yield of glyphosate-tolerant corn. Canadian Journal of Plant Science. 94: 1401-1405.

McNaughton, K. E., Christy Shropshire, Darren E. Robinson and Peter H. Sikkema. (2014). Soybean (Glycine max) tolerance to timing applications of pyroxasulfone, flumioxazin and pyroxasulfone+flumioxazin. Weed Technology 28: 494-500.  

Mahoney, Kris, J. Robert E. Nurse and Peter H. Sikkema. (2014). Tolerance of maize (Zea mays L.) and soybean [Glycine max (L.) Merr.] to late applications of postemergence herbicides. Agricultural Sciences. 5: 1007-1014. 

Ford, Laura, Nader Soltani, Allan McFadden, Robert E. Nurse, Darren E. Robinson and Peter H. Sikkema. (2014). Evaluation of 2,4-D amine, glyphosate, 2,4-D amine plus glyphosate DMA and 2,4-D choline/glyphosate DMA for their efficacy against glyphosate susceptible and glyphosate resistant Canada fleabane populations. Agricultural Sciences. 5: 1053-1060.

Mahoney, Kris, J. Robert E. Nurse, Wesley J. Everman, Christy L. Sprague and Peter H. Sikkema. (2014). Tolerance of corn (Zea mays L.) to early and late glyphosate applications. American Journal of Plant Sciences. 5: 2748-2754.

Ford, Laura, Nader Soltani, Allan McFadden, Robert E. Nurse, Darren E. Robinson and Peter H. Sikkema. (2014). Efficacy of 2,4-D choline/glyphosate dimethylamine on glyphosate resistant Canada fleabane (Conyza canadensis) at different sizes. American Journal of Plant Sciences. 5: 2755-2763.

Soltani, Nader, Robert E. Nurse, Christy Shropshire and Peter H. Sikkema. (2014). Weed control with halosulfuron applied preplant incorporated, preemergence or postemergence in white bean. Agricultural Sciences. 5: 875-881.

Walsh, Kimberly D., Nader Soltani, Lynette R. Brown and Peter H. Sikkema. (2014). Weed control with glyphosate tankmixes applied postemergence in glyphosate-resistant soybean. Canadian Journal of Plant Science 94: 1239-1244.

Ford, Laura, Nader Soltani, Allan McFadden, Robert E. Nurse, Darren E. Robinson and Peter H. Sikkema. (2014). Canada fleabane (Conyza canadensis) control with preplant applied residual herbicides followed by 2,4-D choline/glyphosate DMA applied postemergence in corn. Canadian Journal of Plant Science. 94: 1231-1237.

Walsh, Kimberly D., Nader Soltani, Lynette R. Brown and Peter H. Sikkema. (2014). Biologically effective dose of linuron for the control of glyphosate-resistant giant ragweed (Ambrosia trifida L.) in soybean. American Journal of Plant Science. 5: 2700-2706.

Walsh, Kimberly D., Lynette R. Brown, Nader Soltani and Peter H. Sikkema. (2014). Tolerance of winter wheat to co-application of postemergence herbicides using urea ammonium nitrate carrier. The Open Plant Science Journal. 8: 18-23.

Soltani, Nader, Christy Shropshire and Peter H. Sikkema. (2014). Volunteer Glyphosate and Glufosinate Resistant Corn Competitiveness and Control in Glyphosate and Glufosinate Resistant Corn. Agricultural Sciences. 5: 402-409.

Soltani, Nader, Robert E. Nurse and Peter H. Sikkema. (2014). Weed management in kidney bean with tankmixes of s-metolachlor, imazethapyr and linuron. Agricultural Sciences. 5: 611-617.

Soltani, Nader, Robert E. Nurse and Peter H. Sikkema. (2014). Two-pass weed management with preemergence and postemergence herbicides in glyphosate-resistant soybean. Agricultural Sciences. 5: 504-512.

Mahoney, Kris, J. Christy Shropshire and Peter H. Sikkema. (2014). Weed management in conventional- and no-till soybean (Glycine max) using flumioxazin/pyroxasulfone. Weed Technology. 28: 298-306.

Beckie, H. J., Peter H. Sikkema, Nader Soltani, Nader, Robert E. Blackshaw and Eric N. Johnson. (2014). Environmental Impact of glyphosate-resistant weeds in Canada. Weed Science. 62: 385-392.

Reid, Andrew, Victor Gonzalez, Peter H. Sikkema, Elizabeth A. Lee, Lewis Lukens and Clarence J. Swanton. (2014). Delaying weed control lengthens the anthesis-silking interval in maize. Weed Science. 62: 326-337.

McNaughton, K. E., Lynette R. Brown and Peter H. Sikkema. (2014). Tolerance of winter wheat (Triticum aestivum L.) to fall applied postemergent broadleaf herbicides. American Journal of Plant Science. 5: 1265-1271.

Soltani, Nader, Lynette R. Brown and Peter H. Sikkema. (2014). Weed management in spring seeded barley, oats and wheat with prosulfuron. International Journal of Agronomy. Article ID 950923, 5 pages. DOI: 10.1155/2014/950923.

Mahoney, Kris, J. Francois J. Tardif, Darren E. Robinson, Robert E. Nurse and Peter H. Sikkema. (2014). Tolerance of soybean (Glycine max L.) to protoporphyrinogen oxidase inhibitor and very long chain fatty acid synthesis inhibitors applied preemergence. American Journal of Plant Sciences. 5: 1117-1124.

Soltani, Nader, Christy Shropshire and Peter H. Sikkema. (2014). Response of dry bean to sulfentrazone plus imazethapyr. International Journal of Agronomy. Article ID 287908. 6 pages. DOI: 10.1155/2014/287908.

Ford, Laura, Nader Soltani, Allan McFadden, Robert E. Nurse, Darren E. Robinson and Peter H. Sikkema. (2014). Control of Canada fleabane (Conyza canadensis) with glyphosate DMA/2,4-D choline applications in corn (Zea mays). Agricultural Sciences. 5 (1): 77-83.

Soltani, Nader, Christy Shropshire, Todd Cowan and Peter H. Sikkema. (2014). Weed management in spring cereals with mesotrione. American Journal of Plant Sciences. 5: 153-157.

McNaughton, K. E., Lynette R. Brown and Peter H. Sikkema. (2014). Efficacy of POST glyphosate applications in combination with other POST herbicides in glyphosate-resistant corn (Zea Mays L.). Agricultural Sciences. 5 (1): 1-8.

Soltani, Nader, Robert E. Nurse and Peter H. Sikkema. (2013). Effect of imazethapyr application timing in kidney and white bean. Agricultural Sciences. 12: 678-682.

Soltani, Nader, Christy Shropshire and Peter H. Sikkema. (2013). Response of cranberry and kidney bean to linuron. Agricultural Sciences. 4 (12): 649-653.

McNaughton, K. E., Peter H. Sikkema and Darren E. Robinson. (2013). Response of processing tomato to simulated bromoxynil drift followed by in-crop metribuzin Application. Weed Technology. 27: 762-767.

Stopps, Gregory, J., Robert E. Nurse and Peter H. Sikkema. (2013). Time of day impacts on postemergence weed control in soybean. Weed Technology. 27: 690-695.

Byker, Holly, P., Nader Soltani, Darren E. Robinson, Francois J. Tardif, Mark B. Lawton and Peter H. Sikkema. (2013). Glyphosate resistant Canada fleabane (Conyza canadensis L.): Dose response to glyphosate and control with postemergence herbicides in soybean in Ontario. Canadian Journal of Plant Science. 93: 1187-1193.

Soltani, Nader, Christy Shropshire and Peter H. Sikkema. (2013). Tolerance of mung bean to postemergence herbicides. Agricultural Sciences. 4 (10): 558-562.

Follings, Joanna, Nader Soltani, Darren E. Robinson, Francois J. Tardif, Mark B. Lawton and Peter H. Sikkema. (2013). Distribution of glyphosate and cloransulam -resistant giant ragweed (Ambroisa trifida L.) populations in southern Ontario. Agricultural Sciences. 4 (10): 570-576.

Soltani, Nader, Robert E. Nurse, Christy Shropshire and Peter H. Sikkema. (2013). Response of dry bean to pendimethalin applied preplant incorporated or preemergence. African Journal of Agricultural Research. 8 (38): 4827-4832.

Soltani, Nader, Christopher L. Gillard, Robert E. Nurse and Peter H. Sikkema. (2013). Weed control, environmental impact and profitability of two-pass weed management strategies in glyphosate-resistant corn. Open Plant Science Journal. 7: 31-38. 

Robinson, Darren E., Nader Soltani, Christy Shropshire and Peter H. Sikkema. (2013). Cyprosulfamide safens isoxafultole in sweet corn (Zea mays L.). Horticultural Science. 48 (10): 1262-1265.

Follings, Joanna, Nader Soltani, Darren E. Robinson, Francois J. Tardif, Mark B. Lawton and Peter H. Sikkema. (2013). Glyphosate-resistant giant ragweed (Ambrosia trifida L.): 2,4-D dose response and control with postemergence herbicides in soybean. American Journal of Plant Sciences. 4: 1790-1798.

Soltani, Nader, Robert E. Blackshaw, Robert Gulden, Christopher L. Gillard, Christy Shropshire and Peter H. Sikkema. (2013). Desiccation in dry edible beans with glyphosate tankmixes. Canadian Journal of Plant Science. 93: 871-877.

Byker, Holly, P., Nader Soltani, Darren E. Robinson, Francois J. Tardif, Mark B. Lawton and Peter H. Sikkema. (2013). Occurrence of glyphosate and cloransulam resistant Canada fleabane (Conyza canadensis L.) in Ontario. Canadian Journal of Plant Science. 93: 851-855.

Byker, Holly, P., Nader Soltani, Darren E. Robinson, Francois J. Tardif, Mark B. Lawton and Peter H. Sikkema. (2013). Control of glyphosate-resistant Canada fleabane (Conyza canadensis L.) with dicamba applied preplant and postemergence in dicamba tolerant soybean. Weed Technology. 27: 492-496.

Soltani, Nader, Robert E. Nurse, Eric Page, Wesley  J. Everman, Christy Sprague and and Peter H. Sikkema. (2013).  Influence of late emerging weeds in glyphosate-resistant corn. Agricultural Science. 6: 275-281.

Byker, Holly, P., Nader Soltani, Darren E. Robinson, Francois J. Tardif, Mark B. Lawton and Peter H. Sikkema. (2013). Control of glyphosate-resistant Canada fleabane (Conyza canadensis L.) with preplant herbicide tankmixes in soybean (Glycine max L.). Canadian Journal of Plant Science 93: 659-667.

Soltani, Nader, Robert E. Nurse and Peter H. Sikkema. (2013). Weed management in white bean with postemergence herbicide tankmixes. Canadian Journal of Plant Science. 93: 669-674.

Follings, Joanna, Nader Soltani, Darren E. Robinson, Francois J. Tardif, Mark B. Lawton and Peter H. Sikkema. (2013). Control of glyphosate-resistant giant ragweed in soybean with preplant herbicides. Agricultural Sciences. 4: 195-205.

Soltani, Nader, Robert E. Nurse and Peter H. Sikkema. (2013). Tolerance of white and adzuki bean to pendimethalin plus reduced doses of imazethapyr. African Journal of Plant Science. 7: 143-148.

DeJong, Melody, Mike Cowbrough, Peter H. Sikkema and Francois J. Tardif. (2013). Winter wheat (Triticum aestivum L.)  tolerance to mixtures of herbicides and fungicides applied at different timings. Canadian Journal of Plant Science. 93: 491-501.

Soltani, Nader, Robert E. Nurse, Christy Shropshire and Peter H. Sikkema. (2013). Weed control in white bean with pendimethalin applied preplant followed by postemergence broadleaved herbicides. Open Plant Science Journal. 7: 24-30.

McNaughton, Kristen, E., Peter H. Sikkema and Darren E. Robinson. (2012). Response of processing tomato to simulated glyphosate drift followed by in-crop metribuzin application. Weed Technology. 26: 757-762.

Miller, Robert, T., Nader Soltani,  Darren E. Robinson, Trevor E. Kraus and Peter H. Sikkema. 2012. Soybean (Glycine max) cultivar tolerance to saflufenacil. Canadian Journal of Plant Science. 92: 1319-1328.

Soltani, Nader, Christie L. Stewart, Robert E. Nurse, Laura L. Van Eerd, Richard J. Vyn and Peter H. Sikkema. (2012). Weed control, environmental impact and profitability of weed management strategies in glyphosate-tolerant corn. American Journal of Plant Sciences. 3: 1594-1607.

Robinson, Darren, E., Kristen E. McNaughton and Peter H. Sikkema. (2012). Tolerance of tomato, pepper and potato to pre-emergence applications of saflufenacil. Crop Protection. 42: 230-233.

Stewart, Christie L., Nader Soltani, Robert E. Nurse, Allan S. Hamill and Peter H. Sikkema. (2012). Precipitation influences Pre- and Post-emergence herbicide efficacy in corn. American Journal of Plant Sciences. 3: 1193-1204.

Brown, Lynette, R., Nader Soltani, Christy Shropshire and Peter H. Sikkema. (2012). Response of winter wheat (Triticum aestivum L.) to autumn applied saflufenacil. Agricultural Sciences. 3: 755-758.

Vink, Joseph P., Nader Soltani, Darren E. Robinson, Francois J. Tardif, Mark B. Lawton and Peter H. Sikkema. (2012). Glyphosate-resistant giant ragweed (Ambrosia trifida L.) control with preplant herbicides in soybean (Glycine max L.). Canadian Journal of Plant Science. 92: 913-922.

Soltani, Nader, Christy Shropshire and Peter H. Sikkema. (2012). Response of spring planted cereals to pyroxasulfone. International Research Journal of Plant Science. 3: 113-119.

Vink, Joseph P., Nader Soltani, Darren E. Robinson, Francois J. Tardif, Mark B. Lawton and Peter H. Sikkema. (2012). Glyphosate-resistant giant ragweed (Ambrosia trifida) control in dicamba-tolerant soybean. Weed Technology. 26: 422-428.

Soltani, Nader, Robert E. Nurse and Peter H. Sikkema. (2012). Weed control in dry bean with pendimethalin plus reduced rates of imazethapyr. International Journal of Agricultural Science and Soil Science. 2: 312-317.

Kramer, Christopher, Nader Soltani, Darren E. Robinson, Clarence J. Swanton and Peter H. Sikkema. (2012). Control of volunteer adzuki bean in soybean. Agricultural Science. 4: 501-509.

Soltani, Nader, Robert E. Nurse, Christy Shropshire and Peter H. Sikkema. (2012). Weed control, Environmental impact and profitability of pre-plant incorporated herbicides in white bean. American Journal of Plant Sciences. 3: 846-853.

Soltani, Nader, Christy Shropshire and Peter H. Sikkema. (2012). Weed control in white bean with herbicide-insecticide tankmixes. International Journal of Agricultural Science and Soil Science. 2: 276-285.

Soltani, Nader, Christy Shropshire and Peter H. Sikkema. (2012). Response of dry bean to halosulfuron applied postemergence. Canadian Journal of Plant Science. 92: 723-728.

Vink, Joseph P., Nader Soltani, Darren E. Robinson, Francois J. Tardif, Mark B. Lawton and Peter H. Sikkema. (2012). Glyphosate-resistant giant ragweed (Ambrosia trifida L.) In Ontario: Dose response and control with postemergence herbicides. American Journal of Plant Sciences. 3: 608-617.

Soltani, Nader, Christy Shropshire and Peter H. Sikkema. (2012). Safening effect of bentazon on cloransulam-methyl and halosulfuron-methyl in dry bean. Agricultural Sciences. 3: 368-374.

Soltani, Nader, Robert E. Nurse, Christy Shropshire and Peter H. Sikkema. (2012). Co-application of herbicides and insecticides in dry bean. Agricultural Sciences. 3: 361-367.

Vink, Joseph P., Nader Soltani, Francois J. Tardif, Darren E. Robinson, Mark B. Lawton and Peter H. Sikkema. (2012). Occurrence and distribution of glyphosate-resistant giant ragweed (Ambrosia trifida L.) in southwestern Ontario. Canadian Journal of Plant Science. 92: 533-539.

Miller, Robert, T., Nader Soltani, Darren E. Robinson, Trevor E. Kraus and Peter H. Sikkema. (2012). Biologically effective rate of saflufenacil/dimethenamid-p in soybean (Glycine max). Canadian Journal of Plant Science. 92: 517-531.

Brown, Lynette, R., Nader Soltani, Christy Shropshire and Peter H. Sikkema. (2012). Response of winter wheat (Triticum aestivum L.) to glyphosate tankmixes. International Research Journal of Agricultural Science and Soil Science. 2: 142-148.

Soltani, Nader, Christy Shropshire and Peter H. Sikkema. (2012). Urea ammonium nitrate as the carrier for herbicides in winter wheat. American Journal of Plant Sciences. 3: 417-424.

Soltani, Nader, Christy Shropshire and Peter H. Sikkema. (2012). Co-application of glyphosate plus an insecticide or fungicide in glyphosate-resistant soybean. Canadian Journal of Plant Science. 92: 297-302.

Darren E. Robinson, Nader Soltani and Peter H. Sikkema. (2012). Response of eight sweet corn (Zea mays L.) Hybrids to saflufenacil alone or premixed with dimethenamid-p. American Journal of Plant Sciences. 3: 96-101.

Soltani, Nader, Allan. C. Kaastra, A., Clarence J. Swanton, and Peter H. Sikkema. (2012). Efficacy of topramezone and mesotrione for the control of annual grasses. International Research Journal of Agricultural Science and Soil Science. 2: 46-50.

Soltani, Nader, Christy Shropshire and Peter H. Sikkema. (2012). Weed control and sensitivity of oats (Avena sativa L.) with various doses of safulfenacil. Crop Protection. 31: 45-49.

Soltani, Nader, Robert E. Nurse, Christy Shropshire and Peter H. Sikkema. (2011). Response of eight market classes of dry bean (Phaseolus vulgaris) to pendimethalin. American Journal of Plant Sciences. 2: 835-840.

Soltani, Nader, Robert E. Nurse, Darren E. Robinson and Peter H. Sikkema. (2011). Effect of ammonium sulfate and water hardness on glyphosate/glufosinate activity in corn. Canadian Journal of Plant Science. 91: 1053-1059.

Soltani, Nader, Christy Shropshire and Peter H. Sikkema. (2011). Influence of manganese on efficacy of glyphosate in glyphosate-resistant soybean. Canadian Journal of Plant Science. 91: 1061‑1064.

Stewart, Christie L., Robert E. Nurse, Laura L. Van Eerd, Richard J. Vyn and Peter H. Sikkema. (2011). Weed control, environmental impact and economics of weed management strategies in glyphosate-tolerant soybean. Weed Technology. 25: 535-541.                                                                                                                                                                    

Soltani, Nader, Christy Shropshire and Peter H. Sikkema. (2011). Sensitivity of durum wheat (Triticum turgidum) to various postemergence herbicides. Agricultural Sciences. 2: 451-456.

Moran, Meghan, Peter H. Sikkema and Clarence J. Swanton. (2011). Efficacy of saflufenacil plus dimethenamid-p for weed control in corn. Weed Technology. 252: 330-334.

Soltani, Nader, Christy Shropshire and Peter H. Sikkema. (2011). Weed management in cranberry bean with linuron. Canadian Journal of Plant Science. 91: 881-888.

Nurse, Robert E., Peter H. Sikkema and Darren E. Robinson. (2011).  Weed control and sweet maize (Zea mays L.) yield as affected by pyroxasulfone dose. Crop Protection. 30: 789-793.

Soltani, Nader, Christy Shropshire and Peter H. Sikkema. (2011). Responses of spring planted barley (Hordeum vulgare L.), oats (Avena sativa L.) and wheat (Triticum aestivum L.) to mesotrione. Crop Protection. 30: 849-853.

Soltani, Nader, Christy Shropshire and Peter H. Sikkema. (2011). Giant ragweed (Ambrosia trifida L.) control in corn. Canadian Journal of Plant Science. 91: 577-581.

Soltani, Nader, Hamid R. Mashhadi, Mohsen B. Mesgaran, Mike Cowbrough, Francois J. Tardif, Kevin Chandler, Robert E. Nurse, Clarence J. Swanton and Peter H. Sikkema. 2011. The effect of residual corn herbicides on injury and yield of soybean seeded in the same season. Canadian Journal of Plant Science. 91: 571-576.

Pynenburg, Gerard, Peter H. Sikkema, Darren E. Robinson and Chris L. Gillard. (2011). The interaction of annual weed and white mold management systems for dry bean production in Canada. Canadian Journal of Plant Science. 91: 587-598.

Pynenburg, Gerard, Peter H. Sikkema and Chris L. Gillard. (2011). Agronomic and economic assessment of intensive pest management of dry bean (Phaseolus vulagris). Crop Protection. 30: 340-348.

Moran, Meghan, Peter H. Sikkema, J. Christopher Hall and Clarence J. Swanton. (2011). Sodium safens saflufenacil applied postemergence to corn. Weed Science. 59: 4-13.

Soltani, Nader, Christy Shropshire and Peter H. Sikkema. (2010). Control of common cocklebur (Xanthium strumarium L.) In corn. Canadian Journal of Plant Science. 90: 933-938.

Kramer, Christopher, Nader Soltani, Clarence J. Swanton, Darren E. Robinson and Peter H. Sikkema. (2010). Control of volunteer adzuki bean (Vigna angularis) with pre- and post-emergence herbicides in corn (Zea mays L.). Canadian Journal of Plant Science. 90: 925-932.

Wilson, G.C., N. Soltani, C.J. Swanton, F.J. Tardif, D.E. Robinson and P.H. Sikkema. (2010). Volunteer wheat (Triticum aestivum L.) competition in corn (Zea mays L.). Canadian Journal of Plant Science. 90: 919-924.

Brown, Lynette, R. and Peter H. Sikkema. (2010). Tolerance of three types of winter wheat (Triticum aestivum L.) To fluroxypyr plus MCPA ester. Canadian Journal of Plant Science. 90: 785-789.

Wilson, G.C., N. Soltani, C.J. Swanton, F.J. Tardif and P.H. Sikkema. (2010). Control of volunteer cereals with post-emergence herbicides in maize (Zea mays L.) Crop Protection. 29: 1389-1395.

Stewart, Christie L., Robert E. Nurse, Allan S. Hamill and Peter H. Sikkema. (2010). Environment and soil conditions influence pre- and postemergence herbicide efficacy in soybean. Weed Technology. 24: 234-239.

Gulden, Robert H., Peter H. Sikkema,  Allan S. Hamill, Francois J. Tardif and Clarence J. Swanton. (2010). Glyphosate-resistant cropping systems in Ontario: Multivariate and nominal trait-based community structure. Weed Science. 58: 278-288.

Soltani, Nader, Christy Shropshire and Peter H. Sikkema. (2010). Adjuvant comparison for postemergence weed control in corn. Canadian Journal of Plant Science. 90: 543-547.

Nurse, Robert, E., Allan S. Hamill, Clarence J. Swanton, Francois J. Tardif and Peter H. Sikkema. (2010). Weed control and yield response to mesotrione in maize. Crop Protection. 29: 652-657.

Soltani, Nader, Christy Shropshire and Peter H. Sikkema. (2010). Sensitivity of leguminous crops to saflufenacil. Weed Technology. 24: 143-146.

Stewart, Christie L., Robert E. Nurse, Chris L. Gillard and Peter H. Sikkema. (2010). Tolerance of adzuki bean (Vigna angularis) to preplant-incorporated, pre-emergence and post-emergence herbicides in Ontario, Canada. Weed Biology and Management. 10: 40-47.

Soltani, Nader, Christy Shropshire and Peter H. Sikkema. (2010). Control of winter cereals in the spring with glyphosate. Crop Protection. 29: 492-495.

Soltani, Nader, Melissa Kumagai, Lynette R. Brown and Peter H. Sikkema. (2010). Long-spine sandbur (Cenchrus longispinus (Hack. In Kneuck.) Fernald) control in corn. Canadian Journal of Plant Science. 90: 241-245.

Soltani, Nader, Christy Shropshire and Peter H. Sikkema. (2010). Tolerance of black, cranberry, kidney and white bean to cloransulam-methyl. Weed Biology and Management. 10: 33-39.

Soltani, Nader, Robert E. Nurse, Laura L. Van Eerd, Richard J. Vyn, Christy Shropshire and Peter H. Sikkema. (2010). Weed control, environmental impact and profitability with trifluralin plus reduced rates of imazethapyr in dry bean. Crop Protection. 29: 364-368.

Soltani, Nader, Laura L. Van Eerd, Richard J. Vyn, Christy Shropshire and Peter H. Sikkema. (2010). Weed control, environmental impact and profitability with glyphosate tankmixes in glyphosate-tolerant corn. Canadian Journal of Plant Science. 90: 1-8.