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Differential Response of Grain Sorghum Hybrids to Foliar-Applied Mesotrione

  • M. Joy M. Abit (a1), Kassim Al-Khatib (a1), David L. Regehr (a1), Mitchell R. Tuinstra (a1), Mark M. Claassen (a1), Patrick W. Geier (a1), Phillip W. Stahlman (a1), Barney W. Gordon (a1) and Randall S. Currie (a1)...


The selection of herbicide-resistant weeds in grain sorghum production has prompted researchers to explore alternative herbicides to prevent, delay, and manage herbicide-resistant weed biotypes. Greenhouse and field experiments were conducted to evaluate the differential response of sorghum hybrids to POST application of mesotrione. In a greenhouse experiment, 85 sorghum hybrids were treated with 0, 52, 105, 210, and 315 g ai/ha mesotrione when plants were at the three- to four-leaf collar stage. Sorghum response ranged from susceptible to tolerant sorghum hybrids. ‘Pioneer 84G62’, ‘Pioneer 85G01’, and ‘Triumph TR 438’ were the three most susceptible, whereas ‘Dekalb DKS35-70’, ‘Frontier F222E’, and ‘Asgrow Seneca’ were the three most tolerant hybrids. One week after treatment (WAT), the mesotrione rate causing 50% visible injury ranged from 121 to 184 and 64 to 91 g/ha in the most tolerant and susceptible hybrids, respectively. Mesotrione dose–response studies were conducted under field conditions on four sorghum hybrids. One WAT, injury symptoms were greater (up to 23%) in Pioneer 85G01 than in Asgrow Seneca (< 14%). However, all plants appeared normal by the end of the growing season. In addition, sorghum yields were not reduced by mesotrione treatments as verified by correlation coefficient analysis.


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Differential Response of Grain Sorghum Hybrids to Foliar-Applied Mesotrione

  • M. Joy M. Abit (a1), Kassim Al-Khatib (a1), David L. Regehr (a1), Mitchell R. Tuinstra (a1), Mark M. Claassen (a1), Patrick W. Geier (a1), Phillip W. Stahlman (a1), Barney W. Gordon (a1) and Randall S. Currie (a1)...


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