Postemergence Control of Red Rice (Oryza sativa)

Abstract

Mefluidide {N-[2,4-dimethyl-5-[[(trifluoromethyl)sulfonyl] amino] phenyl] acetamide}+bentazon [3-isopropyl-1H-2,1,3-benzothiadiazin-4(3H)-one 2,2-dioxide] at 0.14 + 0.84 kg ai/ha was the most injurious of five herbicide treatments applied once to one- to two-leaf red rice (Oryza sativa L. ♯3 ORYSA). The most injurious treatment to five-to six-leaf red rice was DPX Y6202 {ethyl [2-[4-[6-chloro-2-quinoxalinyl]oxy]phenoxy] propionate} at 0.56 kg ai/ha. Two applications, regardless of red rice growth stage, of all treatments except fluazifop {[±]-butyl-2-[4-[[5-trifluoromethyl]-2-pyridinyl] oxy] phenoxy] propanoate} resulted in 86 to 99% injury.

Graminicide Application Timing Influences Red Rice (Oryza sativa) Control and Seedhead Reduction in Soybean (Glycine max)1

“…In a similar study, clethodim at 110 g/ha applied to tillering red rice following PPI or PRE herbicides reduced red rice seedheads nearly 100% (Askew et al 1998). Sequential applications also may improve control and seedhead suppression (Barrentine et al 1984). Our data suggest application timing is more important than the graminicide applied for red rice control and seedhead reduction.…”

“…Red rice control from single applications of many selective grass herbicides is often inconsistent (Khodayari et al 1987;Salzman et al 1989). In most cases, consistency and increased control were achieved with sequential herbicide applications (Barrentine et al 1984;Salzman et al 1988;). a Data are averages of responses from five separate herbicide treatments.…”

“…Red rice control was higher when quizalofop was applied to five-to six-leaf red rice as compared to applications at the two-to three-leaf growth stage (Barrentine et al 1984). Clethodim more consistently reduced red rice seedhead exertion than fluazifop-P or quizalofop-P when applied at 10to 15-cm internode elongation and early booting stages as compared to earlier applications (Guy and Helms 1995).…”

“…Red rice poses a challenging control problem to rice producers because of its physiological similarities to cultivated rice (Rao and Harger 1981;Smith 1979). Mississippi producers, when faced with severe red rice infestations, usually rotate to soybean (Glycine max) for two years, returning to rice the third year (Barrentine et al 1984;Minton et al 1989). Rotation to soybean is a way to reduce red rice seed reserves through use of graminicides in the soybean crop (Rao and Harger 1981;.…”

Red rice (Oryza sativa) Control in Rice (O. sativa) with Preemergence and Postemergence Herbicides1

“…Crop rotation involving soybean [Glycine max (L.) Merr.] reduced red rice infestation (Barrentine et al 1984), but rotation is not always possible and commercially acceptable. The cultural and chemical practices used are mainly early seedbed preparation followed by field flooding to stimulate red rice germination, a treatment with systemic or contact herbicides, and then crop planting (Catala, 1993;Ferrero et al 1999).…”