Control of volunteer adzuki bean in soybean

Christopher Kramer, Nader Soltani, Darren E. Robinson, Clarence J. Swanton, Peter H. Sikkema

University of Guelph, Ridgetown Campus, Ridgetown, Ontario, Canada, N0P 2C0.

DOI: 10.4236/as.2012.34059                

Abstract

The objective of this research was to evaluate the efficacy of various pre-emergence (PRE) and post-emergence (POST) herbicides for the control of volunteer adzuki bean (Vigna angularis (Willd.) Ohwi & Ohashi) in soybean (Glycine max L.). Trials were conducted at two locations in 2005, 2006, 2007, and 2009. Experiments were arranged in a randomized complete block design with either five PRE or nine POST herbicides. Volunteer adzuki bean interference in soybean resulted in yield loss of up to 25%. Cloransulam-methyl, linuron, metribuzin, flumetsulam, and imazethapyr applied PRE provided up to 6, 24, 14, 8, and 0% control, respectively at 8 weeks after emergence (WAE), while acifluorfen, fomesafen, bentazon, thifensulfuron-methyl, cloransulam-methyl, imazethapyr, and imazethapyr plus bentazon applied POST provided 2, 2, 5, 34, 6, 4, and 12% control, respectively at 8 weeks after application (WAA). Generally, with the aforementioned herbicides, soybean yield was equivalent to the weedy control and soybean grain contamination with adzuki bean seed was consistently above the 1% maximum threshold. Chlorimuron-ethyl and glyphosate applied POST provided up to 84 and 94% visual control at 8 WAA, respectively, decreased adzuki bean density, biomass, and seed production, and generally decreased soybean contamination with adzuki bean below the 1% threshold. The only herbicides evaluated in this study that controlled volunteer adzuki bean in soybean were chlorimuron-ethyl (9 g ai.ha^-1) and glyphosate (900 g ai.ha^-1) applied POST. All the other PRE and POST herbicides evaluated did not provide adequate control of volunteer adzuki bean in soybean.

Keywords

Acifluorfen; Bentazon; Chlorimuron-Ethyl; Cloransulam-Methyl; Flumetsulam; Fomesafen; Imazethapyr; Linuron; Metribuzin; Pre-Emergence; Post-Emergence; Thifensulfuron-Methyl

Conflicts of Interest

The authors declare no conflicts of interest.

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