Hostname: page-component-78c5997874-8bhkd Total loading time: 0 Render date: 2024-11-14T07:11:01.088Z Has data issue: false hasContentIssue false
  • English
  • Français

MON-37500 for Weed Control and Alfalfa Seed Production

Published online by Cambridge University Press:  20 January 2017

Clayton D. Myhre ,
Heather A. Loeppky  and
F. Craig Stevenson
Clayton D. Myhre
Affiliation:
Agriculture and Agri-Food Canada, Melfort Research Farm, Box 1240, Melfort, Saskatchewan, Canada S0E 1A0
Heather A. Loeppky
Affiliation:
Agriculture and Agri-Food Canada, Melfort Research Farm, Box 1240, Melfort, Saskatchewan, Canada S0E 1A0
F. Craig Stevenson*
Affiliation:
142 Rogers Road, Saskatoon, Saskatchewan, Canada S7N 3T6
*
Corresponding author's E-mail: fcstevenson@shaw.ca
Get access Rights & Permissions [Opens in a new window]

Abstract

Alfalfa seed producers have a limited number of herbicide options to manage weed problems. MON-37500 (proposed name sulfosulfuron) is a sulfonylurea herbicide that controls dandelion and quackgrass, two common weeds in alfalfa fields. A study was conducted in two alfalfa fields at Valparaiso and Carrot River, Saskatchewan, Canada, from 1999 to 2001 to evaluate perennial weed control and alfalfa production responses with 0.5×, 1×, and 1.5× label-recommended rates of MON-37500 and also 2,4-DB and hexazinone. MON-37500 applied at the 1× and 1.5× rates at both locations reduced mid-May alfalfa vigor from 100% to between 80 and 90% and increased early-season control of dandelion and quackgrass by about 10 to 40 percentage units, when compared with other herbicide treatments. Improved weed control with 1× and 1.5× MON-37500 rates was sustained into mid-June only at Carrot River and was completely eliminated (100% vigor and 0% weed control), or almost so, by mid-July. MON-37500 did not control Canada thistle. Improved early-season weed control with the 1× MON-37500 rate apparently compensated for the loss of alfalfa vigor at Valparaiso, thus resulting in 27% (57 kg/ha) greater seed yield than with the other herbicide treatments. At Carrot River, hexazinone generally provided levels of weed control similar to MON-37500 but did not injure alfalfa. Consequently, alfalfa yields were highest and the proportion of dead (decaying) seed was least with this treatment. The 0.5× MON-37500 rate often resulted in inferior weed control relative to the 1× and 1.5× rates and never was among the herbicide treatments providing the greatest seed yield. Managing the residual activity of MON-37500 and its negative effect on alfalfa growth, especially at locations with soils having coarse texture and low organic matter content, represents the greatest challenge in making MON-37500 a reliable weed management tool for alfalfa seed producers.

Keywords

2,4-DBhexazinoneMON-37500, N-[[(4,6-dimethoxy-2-pyrimidinyl)-amino]-carbonyl]-2-(ethyl-sulfonyl)imidazo[1,2-a]pyridine-3-sulfonamideCanada thistle, Cirsium arvense (L.) Scop. # CIRARdandelion, Taraxacum officinale Weber in Wiggers # TAROFquackgrass, Elytrigia repens (L.) Neviski # AGRREalfalfa, Medicago sativa L.Herbicide managementsulfonylureaweed interference
Type
Research
Information
Weed Technology , Volume 18 , Issue 3 , September 2004 , pp. 810 - 815
Copyright
Copyright © Weed Science Society of America 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

Footnotes

∗ Saskatoon Research Centre Manuscript 1575.

References

Literature Cited

[CFIA] Canadian Food Inspection Agency. 1997. Canadian Methods and Procedures for Testing Seed. Ottawa, Ontario, Canada: Canadian Food Inspection Agency. Pp. 44–109.Google Scholar
Harker, K. N., Clayton, G. W., Blackshaw, R. E., O'Donovan, J. T., and Stevenson, F. C. 2003. Seeding rate, herbicide timing and competitive hybrids contribute to integrated weed management in canola (Brassica napus). Can. J. Plant Sci 83:433–440.Google Scholar
Kuzior, S., Spitalniak, J., Pawinska, M., and Urbanowicz, J. 1999. Sulfosulfuron use in potatoes. Proc. Br. Crop Prot. conf. Weeds. Pp. 349–354.Google Scholar
Liebman, M. and Davis, A. S. 2000. Integration of soil, crop and weed management in low-external-input farming systems. Weed Res 40:27–47.CrossRefGoogle Scholar
Littel, R. C., Milliken, G. A., Stroup, W. W., and Wolfinger, R. D. 1996. SAS System for Mixed Models. Cary, NC: SAS Institute. 656 p.Google Scholar
Loeppky, H. A. and Thomas, A. G. 1998. Weed survey of Saskatchewan alfalfa seed fields. in Proceedings of the Sixteenth Canadian Alfalfa Seed conference; January 15–17, 1998; Saskatoon, Saskatchewan, Canada. Pp. 53–58.Google Scholar
Malik, N., Bowes, G. G., and Waddington, J. 1993. Residual herbicides for weed control in established alfalfa (Medicago sativa) grown for seed. Weed Technol. 7:483–490.Google Scholar
Moyer, J. R., Acharya, S. N., Boswall, A. L., and Dalton, R. E. 2000. Dandelion control in alfalfa. Can. J. Plant Sci 80:226.Google Scholar
Moyer, J. R. and Schaalje, G. B. 1993. Quackgrass (Elytrigia repens) interference and control in seed alfalfa (Medicago sativa). Weed Technol. 7:58–64.Google Scholar
Rainbolt, C. R., Sanders, S. M., Thill, D. C., and Christianson, K. 1999. Quackgrass control in wheat with sulfosulfuron. Proc. West. Soc. Weed Sci 52:59.Google Scholar
Rola, H., Rola, J., and Badowski, M. 2000. Regrowth of rhizomes of Elymus repens (L.) GOULD after herbicide application. in Haas, H. U. and Hurle, K., eds. Proceedings of the Twentieth German Conference on Weed Biology and Weed Control; March 14–16, 2000; Stuttgart-Hohenheim, Germany. Z. Pflanzenkr. Pflanzenschutz. Pp. 607–612.Google Scholar
Saskatchewan Agriculture and Food. 2003. Guide to Crop Protection 2003. Regina, Saskatchewan, Canada: Saskatchewan Agriculture and Food. 355 p.Google Scholar
Thomas, A. G., Leeson, J. Y., Myhre, C., and Loeppky, H. A. 2000. Farm management practices used for alfalfa seed production. Sask. Alfalfa Seed Producers Assoc. Newsletter 13:17–27.Google Scholar