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Glyphosate-resistant Horseweed (Conyza Canadensis) Control with Glufosinate Prior to Planting No-till Cotton (Gossypium Hirsutum)

  • Lawrence E. Steckel (a1), C. Chism Craig (a1) and Robert M. Hayes (a1)

Control of glyphosate-resistant (GR) horseweed in no-till cotton has become a serious challenge for midsouth producers. Control of GR horseweed prior to no-till cotton planting (burndown) was examined with glufosinate applied at a standard rate (0.47 kg ai/ha) 30, 21, and 14 d before planting (DBP) and at 0.35 and 0.58 kg ai/ha 14 DBP. Glufosinate at 0.47 kg ai/ha was also tank-mixed with 2,4-D, dicamba, or flumioxazin 30 DBP, and with diuron, pendimethalin, prometryn, or glyphosate at 14 DBP. Glufosinate applied at the standard rate 21 or 30 DBP did not control GR horseweed (<55%), but did provide better control (85%) when applied 14 DBP. The high rate of glufosinate (0.58 kg ai/ha) applied 14 DBP controlled GR horseweed. Tank mixtures of glufosinate with dicamba or 2,4-D at 30 DBP controlled GR horseweed. Tank mixtures of glufosinate with either prometryn or diuron provided initial burndown and residual weed control. Tank mixtures of glufosinate + pendimethalin or flumioxazin did not increase control of existing horseweed, but did provide residual control 56 days after application.

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D. M. Anderson , C. J. Swanton , J. C. Hall , and B. G. Mersey 1993. The influence of temperature and relative humidity on the efficacy of glufosinate-ammonium. Weed Res. 33:139147.

S. G. Carmer , W. E. Nyquist , and W. M. Walker 1989. Least significant differences for combined analysis of experiments with two or three-factor treatment designs. Agron. J. 81:665672.

C. L. Main , T. C. Mueller , R. M. Hayes , and J. B. Wilkerson 2004. Response of selected horseweed [Conyza canadensis (L) Cronq.] populations to glyphosate. J. Agric. Food Chem. 52:879883.

M. M. Vangessel 2001. Glyphosate-resistant horseweed from Delaware. Weed Sci. 49:703705.

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Weed Technology
  • ISSN: 0890-037X
  • EISSN: 1550-2740
  • URL: /core/journals/weed-technology
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