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1 January 2009 Differential Response of Grain Sorghum Hybrids to Foliar-Applied Mesotrione
M. Joy M. Abit, Kassim Al-Khatib, David L. Regehr, Mitchell R. Tuinstra, Mark M. Claassen, Patrick W. Geier, Phillip W. Stahlman, Barney W. Gordon, Randall S. Currie
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Abstract

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.

Nomenclature: Mesotrione; sorghum, Sorghum bicolor (L.) Moench. SORBI

M. Joy M. Abit, Kassim Al-Khatib, David L. Regehr, Mitchell R. Tuinstra, Mark M. Claassen, Patrick W. Geier, Phillip W. Stahlman, Barney W. Gordon, and Randall S. Currie "Differential Response of Grain Sorghum Hybrids to Foliar-Applied Mesotrione," Weed Technology 23(1), 28-33, (1 January 2009). https://doi.org/10.1614/WT-08-086.1
Received: 17 June 2008; Accepted: 1 October 2008; Published: 1 January 2009
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KEYWORDS
HPPD-inhibiting herbicides
hybrids
visible injury
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