Synergism with Imazamox Co-applications for Red Rice Control

• Published in: Weed technology 2017-05, Vol.31 (3), p.373-379
• Main Authors: Webster, Eric P, Teló, Gustavo M, Blouin, David C, McKnight, Benjamin M, Bergeron, Eric A
• Format: Article
• Language: English
• Subjects: Agricultural production; Antagonism; Handbooks; Herbicides; neutral response; Propanil; Rice; Synergism; Thiobencarb; WEED MANAGEMENT-MAJOR CROPS; Weeds
• ISSN: 0890-037X; 1550-2740
• DOI: 10.1017/wet.2017.19

A study was conducted at three locations in Louisiana to evaluate the interactions of imazamox at 44 g ai ha-1 mixed with propanil, thiobencarb, or with a prepackaged mixture of propanil plus thiobencarb. A synergistic response was observed for red rice control for all treatments at 14 days after treatments (DAT); however, at 21 DAT a neutral response was observed for imazamox mixed with propanil or thiobencarb. A synergistic response occurred for red rice control when imazamox was mixed with propanil plus thiobencarb at 3360 g ai ha-1 for all evaluation dates; however, imazamox mixed with propanil plus thiobencarb at 1680 g ha-1 resulted in synergism at the same evaluations except at 35 DAT with neutral response. Synergism was observed for barnyardgrass control with imazamox mixed with propanil plus thiobencarb at 3360 g ha-1 at 35 and 49 DAT. The only antagonism observed for barnyardgrass control was at 42 DAT with imazamox plus propanil at 840 and 1680 g ha-1 or mixed with the prepackage mixture at 1680 g ha-1. Rice treated with imazamox mixed with propanil plus thiobencarb at 3360 g ha-1 yielded 5770 kg ha-1. Nomenclature: Propanil; thiobencarb; barnyardgrass, Echinochloa crus-galli (L.) Beauv.; red rice, Oryza sativa L.; rice, Oryza sativa L.