Skip to main content Accessibility help
×
Home

Response of paraquat-resistant and -susceptible horseweed (Conyza canadensis) to diquat, linuron, and oxyfluorfen

  • Susan Weaver, Michael Downs (a1) and Brandi Neufeld (a1)

Abstract

Horseweed is a winter annual weed that has evolved resistance to multiple herbicide modes of action in 11 countries worldwide. A paraquat-resistant horseweed population in an Ontario orchard that was being managed by a rotation of herbicides began to show increased tolerance to the herbicide linuron. Experiments were conducted in the greenhouse to compare the response of this population and several paraquat-susceptible populations to linuron, diquat, and oxyfluorfen. Plants were sprayed with a range of doses of each herbicide when they were from 5 to 10 wk old, and the ED50, or dose at which shoot dry weight was reduced by 50%, was estimated. There was a sevenfold difference in the ED50 values of the paraquat-resistant and -susceptible populations in response to diquat and a threefold difference in response to linuron. The response to oxyfluorfen was age dependent. The ratio of resistance to susceptible ED50 values was estimated as 57 for 5-wk-old plants and 11 for 8-wk-old plants in response to oxyfluorfen. Ten-week-old plants from both populations showed no response to oxyfluorfen at rates up to 4.8 kg ai ha−1.

Copyright

Corresponding author

Corresponding author. Greenhouse and Processing Crops Research Centre, Agriculture and Agri-Food Canada, Harrow, Ontario, Canada N0R 1G0; weavers@agr.gc.ca

References

Hide All
Alizadeh, H. M., Preston, C., and Powles, S. B. 1998. Paraquat-resistant biotypes of Hordeum glaucum from zero-tillage wheat. Weed Res 38:139142.
Amsellem, Z., Jansen, M. A. K., Driesenaar, A. R. J., and Gressel, J. 1993. Developmental variability of photooxidative stress tolerance in paraquat-resistant Conyza. Plant Physiol 103:10971106.
Gadamski, G., Ciarka, D., Gressel, J., and Gawronski, S. W. 2000. Negative cross-resistance in triazine-resistant biotypes of Echinochloa crus-galli and Conyza canadensis . Weed Sci 48:176180.
Heap, I. M. 2003. International Survey of Herbicide-Resistant Weeds. www.weedscience.com.
Matsumoto, H., Kashimoto, Y., and Warabi, E. 1999. Basis for common chickweed (Stellaria media) tolerance to oxyfluorfen. Pestic. Biochem. Physiol 64:4753.
Monaco, T. J., Weller, S. C., and Ashton, F. M. 2002. Membrane disrupters. Pages 235255 in Weed Science. 4th ed. New York: J. Wiley.
Pölös, E., Laskay, G., Szigeti, Z., Pataki, Sz, and Lehoczki, E. 1987. Photosynthetic properties and cross-resistance to some urea herbicides of triazine-resistant Conyza canadensis Cronq (L). Z. Naturforsch 24c:783793.
Pölös, E., Mikulas, J., Szigeti, Z., Matkovics, B., Hai, D. Q., Parducz, A., and Lehoczki, E. 1988. Paraquat and atrazine co-resistance in Conyza canadensis (L.) Cronq. Pestic. Biochem. Physiol 30:142154.
Preston, C. 1994. Resistance to photosystem I disrupting herbicides. Pages 6182 in Powles, S. B. and Holtum, J.A.M. eds. Herbicide Resistance in Plants: Biology and Biochemistry. Boca Raton, FL: Lewis.
[SAS] Statistical Analysis Systems. 2000. SAS/STAT Software, Release 8.1. Cary, NC: Statistical Analysis Systems Institute Pp. 23712381.
Seefeldt, S. S., Jensen, J. E., and Fuerst, E. P. 1995. Log-logistic analysis of herbicide dose-response relationships. Weed Technol 9:218227.
Shaaltiel, Y., Glazer, A., Bocion, P. F., and Gressel, J. 1988. Cross tolerance to herbicidal and environmental oxidants of plant biotypes tolerant to paraquat, sulfur dioxide, and ozone. Pestic. Biochem. Physiol 31:1323.
Smisek, A., Doucet, C., Jones, M., and Weaver, S. 1998. Paraquat resistance in horseweed (Conyza canadensis) and Virginia pepperweed (Lepidium virginicum) from Essex County, Ontario. Weed Sci 46:200204.
VanGessel, M. J. 2001. Glyphosate-resistant horseweed from Delaware. Weed Sci 49:703705.
Vaughn, K. C., Vaughan, M. A., and Camilleri, P. 1989. Lack of cross-resistance of paraquat-resistant hairy fleabane (Conyza bonariensis) to other toxic oxygen generators indicates enzymatic protection is not the resistance mechanism. Weed Sci 37:511.
Ye, B. and Gressel, J. 2000. Transient, oxidant-induced antioxidant transcript and enzyme levels correlate with greater oxidant-resistance in paraquat-resistant Conyza bonariensis . Planta 211:5061.

Keywords

Response of paraquat-resistant and -susceptible horseweed (Conyza canadensis) to diquat, linuron, and oxyfluorfen

  • Susan Weaver, Michael Downs (a1) and Brandi Neufeld (a1)

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed