Glufosinate Tank-Mix Combinations in Glufosinate-Resistant Rice (Oryza sativa)¹

Abstract

At 14 d after treatment (DAT), glufosinate at 0.42 kg ai/ha controlled barnyardgrass and broadleaf signalgrass 85 and 86%, respectively. Antagonism occurred for barnyardgrass control with all mixtures of glufosinate at 0.42 kg/ha. At 14 DAT, no herbicide was superior to glufosinate at either rate when applied in mixture for the control of broadleaf signalgrass. Rice flatsedge control 7 DAT was 68 and 82% with glufosinate at 0.42 and 0.84 kg/ha alone, respectively. The addition of propanil and triclopyr enhanced rice flatsedge control over that with glufosinate alone at 0.42 or 0.84 kg/ha. At 7 DAT, all herbicide mixtures increased spreading dayflower control compared with a single treatment of glufosinate at 0.42 kg/ha. By 28 DAT, spreading dayflower control was less than 80% with all treatments. Rice injury was less than 15% with all treatments.

Florpyrauxifen-benzyl Weed Control Spectrum and Tank-Mix Compatibility with other Commonly Applied Herbicides in Rice

“…Combinations of two or more herbicides provide an opportunity for an interaction to occur that could be greater than (synergistic) or less than (antagonistic) an expected response (Colby 1967; Fish et al 2015, 2016). For example, Lanclos et al (2002) reported an antagonistic response when glufosinate was mixed with bensulfuron or triclopyr, resulting in reduced barnyardgrass control. Conversely, a synergistic effect was observed for barnyardgrass control when tank-mixing propanil with quinclorac, thiobencarb, or pendimethalin (Baltazar and Smith 1994).…”

Biology and Control of Creeping Rivergrass (Echinochloa polystachya) in Rice

“…Glyphosate controls barnyardgrass as well as knotgrass, a perennial grass with similar growing characteristics to creeping rivergrass (De Datta et al 1979;Norris et al 2001). Glufosinate controls barnyardgrass, genetically similar to creeping rivergrass (Lanclos et al 2002). Glyphosate and glufosinate are not currently labeled for rice; however, burndown prior to planting mighty be an option.…”

How well will stacked transgenic pest/herbicide resistances delay pests from evolving resistance?

“…Transgene stacks with glufosinate and PPO (protoporphyrinogen IX oxidase)‐inhibiting herbicides would not be at risk of resistance evolving in weeds if the above‐listed criteria were observed. However, there is the possibility that combining contact herbicides may present a problem, as the efficacy of one or both of the herbicides may be compromised by antagonistic interference . One caveat is that some A. tuberculatus and A. palmeri populations have already evolved resistance to the PPO‐inhibiting herbicides, and resistant populations are evolving with increasing frequency .…”