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1 January 2008 Influence of Flood Interval and Cultivar on Rice Tolerance to Penoxsulam
Samuel D. Willingham, Garry N. McCauley, Scott A. Senseman, James M. Chandler, John S. Richburg, Ralph B. Lassiter, Richard K. Mann
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Abstract

Studies were conducted in 2003 and 2004 over seven environments evaluating rice root growth inhibition (RGI) and foliar injury from penoxsulam at 30 and 60 g ai/ha and bispyribac-sodium at 30 g ai/ha applied to four- to five-leaf rice at three flood timings, 1, 7, and 14 d after herbicide treatment (DAT), for five rice cultivars, ‘Bengal’, ‘Cypress’, ‘Wells’, ‘Cocodrie’, and ‘XP712’. Flooding at 1 and 7 DAT resulted in greater RGI compared with flood at 14 DAT when evaluated 1 wk after flood (WAF). By 2 WAF, RGI was greater with flooding at 1 DAT compared with flooding at 7 DAT for cultivars Bengal, Cypress, and Wells. Analyzing flood timing 1 DAT, bispyribac-sodium reduced root growth of Bengal and Cypress compared with penoxsulam at 30 g/ha at 1 week after treatment (WAT). At 2 WAT, RGI for Cocodrie was higher following penoxsulam at 60 g/ha when compared with bispyribac-sodium. By 3 WAT, RGI was higher following penoxsulam at 60 g/ha when compared with penoxsulam at 30 g/ha for Cocodrie and greater than bispyribac-sodium and penoxsulam at 30 g/ha for Cypress. Foliar injury following penoxsulam at both rates was less than injury following bispyribac-sodium for all cultivars except XP712 at 1 WAT. XP712 resulted in < 5% RGI and < 6% foliar injury at each evaluation. Rice grain yield was not affected by herbicide treatment for any cultivar compared with the standard treatment of propanil plus quinclorac.

Nomenclature: Bispyribac-sodium, penoxsulam, propanil, quinclorac, rice, Oryza sativa L. ‘Bengal’, ‘Cocodrie’, ‘Cypress’, ‘Wells’, ‘XP712’

Samuel D. Willingham, Garry N. McCauley, Scott A. Senseman, James M. Chandler, John S. Richburg, Ralph B. Lassiter, and Richard K. Mann "Influence of Flood Interval and Cultivar on Rice Tolerance to Penoxsulam," Weed Technology 22(1), 114-118, (1 January 2008). https://doi.org/10.1614/WT-07-106.1
Received: 2 July 2007; Accepted: 1 October 2007; Published: 1 January 2008
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