Weed control and yield response to mesotrione in maize (Zea mays) |
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Authors: | Robert E. Nurse,Allan S. Hamill,Clarence J. Swanton,Franç ois J. Tardif,Peter H. Sikkema |
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Affiliation: | 1. Agriculture and Agri-Food Canada, 2585 County Road, 20 R.R. #2 Harrow, ON N0R 1G0, Canada;2. University of Guelph, Guelph, ON N1G 2W1, Canada;3. University of Guelph, Ridgetown Campus, Ridgetown, ON N0P 2C0, Canada |
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Abstract: | Mesotrione has recently been registered for weed control in maize in Ontario, Canada; however, there is still little information on the doses required to provide 90% control for the complete spectrum of broadleaved weeds that the product controls. Our objective was to determine mesotrione doses that would provide at least 90% control of four economically important weeds, without impacting final maize yield by more than 5% in comparison to a weed-free control. Sixteen field trials were conducted at six Ontario locations in 1999–2001 to evaluate the effectiveness of mesotrione at doses ranging from 9 to 280 g ai ha−1. The doses required to reduce weed biomass by at least 90% (I90) varied with location and year, and for common lambsquarters and velvetleaf differed by application timing. For lambsquarters, the estimated doses required ranged from 10 to 1984 g ai ha−1 for preemergence applications and 15–38 g ai ha−1 for postemergence applications. Doses of 45 and 19–243 g ai ha−1 were required to effectively reduce the biomass of redroot pigweed. Velvetleaf was effectively controlled preemergence with 288 g ai ha−1 and postemergence with 31 g ai ha−1 of mesotrione. Final maize yield was only reduced by more than 5% of a weed-free control when a dose of less than 35 g ai ha−1 of mesotrione was applied. These results show that biologically effective weed control with reduced doses of mesotrione is possible depending on the spectrum of broadleaved weed species present in the field. |
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Keywords: | Integrated weed management Biologically effective Weed dry matter |
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