ABSTRACT, 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

. 2010. Control of volunteer adzuki bean (Vigna angularis) with pre-and postemergence herbicides in corn (Zea mays). Can. J. Plant Sci. 90: 925Á932. Volunteer adzuki bean within a corn crop can decrease corn yield and increase the adzuki bean seed bank. The objective of this research was to evaluate the efficacy of various preemergence (PRE) and postemergence (POST) herbicides for the control of volunteer adzuki bean [Vigna angularis (Willd.) Ohwi & Ohashi] in corn. Trials were conducted at two locations in 2005, 2006, 2007 and 2009. Experiments were arranged in a randomized complete block design with either seven PRE or ten POST herbicides. Volunteer adzuki bean interference resulted in corn yield losses of 16 to 43%. The PRE herbicides provided variable control. The highest and most consistent control PRE was provided by dicamba/atrazine, which provided 69 to 97% control of volunteer adzuki bean at 4 and 8 wk after emergence (WAE), respectively. Dicamba/atrazine PRE reduced volunteer adzuki bean density and biomass 67 to 97% 10 WAE. Generally, the POST herbicides evaluated provided better and more consistent control of volunteer adzuki bean than the PRE herbicides. Dicamba/atrazine applied POST provided greater than 95% control of volunteer adzuki bean and consistently reduced volunteer adzuki bean density and biomass to the equivalent of the weed-free control. Dicamba/atrazine applied POST resulted in corn yields equivalent to the weed-free control. The best option for controlling volunteer adzuki bean in corn is to apply dicamba/atrazine POST, while the remaining herbicides evaluated provided variable control.Key words: Biomass, density, emergence, dry weight, yield Kramer, C., Soltani, N., Swanton, C. J., Robinson, D. E. and Sikkema, P. H. 2010. Lutte contre la repousse spontane´e du haricot adzuki (Vigna angularis) avec des herbicides pre´leve´e et post-leve´e dans les champs de maı¨s (Zea mays). Can. J. Plant Sci. 90: 925Á932. La repousse spontane´e du haricot adzuki dans les cultures peut re´duire le rendement du maı¨s tout en grossissant le re´servoir de semences du haricot. Les auteurs voulaient e´valuer l'efficacite´de divers herbicides pre´leve´e et post-leve´e dans la lutte contre les repousses spontane´es de haricot adzuki [Vigna angularis (Willd.) Ohwi & Ohashi], dans les champs de maı¨s. Les essais se sont de´roule´s à deux endroits en 2005, 2006, 2007 et 2009. Les expe´riences ont e´teá gence´es en blocs ale´atoires complets avec sept herbicides pre´leve´e ou dix post-leve´e. La repousse spontane´e du haricot adzuki re´duit le rendement du maı¨s de 16 a`43 %. Les herbicides pre´leve´e donnent des re´sultats variables dans la lutte contre cette adventice. Les meilleurs re´sultats, e´galement les plus constants, viennent de l'utilisation du dicamba/atrazine, qui de´truit de 69 a`97 % des repousses spontane´es, 4 et 8 semaines apre`s la leve´e, respectivement. L'application de dicamba/atrazine avant la leve´e diminue la densite´des repousses spontane´es de haricot adzuki et leur biomasse de 67 a9...

]. There was minimal injury (2% or less) to soybean from the PRE and POST herbicides evaluated. Cloransulam applied PRE provided up to 98% visual control, reduced density 93%, and reduced dry weight of cocklebur 96%. Linuron, metribuzin, imazethapyr, and clomazone applied PRE provided 0 to 77% control and reduced density and dry weight of cocklebur minimally (54% or less) compared with the weedy check. Cloransulam applied POST provided as much as 98% control, reduced density up to 96%, and reduced dry weight of cocklebur as much as 98%. Chlorimuron, imazethapyr, imazethapyr plus bentazon, and glyphosate applied POST provided 49 to 90% control, reduced density 62 to 89%, and reduced dry weight of cocklebur 69 to 92%. Acifluorfen, fomesafen, bentazon, and thifensulfuron applied POST provided 1 to 51% control, reduced density 0 to 80%, and reduced dry weight 0 to 74% compared with the weedy check. Soybean yield increased as much as 79% compared with the weedy check as a result of cloransulam applied PRE or POST. Based on these results, cloransulam applied PRE or POST provides excellent control of cocklebur in soybean. . Les herbicides e´value´s ont cause´peu de dommages (2 % ou moins) a`la culture. Le cloransulam applique´avant la leve´e de´truit jusqu'a`98 % de l'adventice (examen visuel) dont il diminue la densite´de peuplement de 93 % et le poids sec de 96 %. L'application de linuron, de me´tribuzine, d'imaze´thapyr et de clomazone avant la leve´e de´truit 0 a`77 % de la lambourde avec une re´duction minimale de la densite´de peuplement et du poids sec (54 % ou moins), comparativement aux parcelles te´moins infeste´es. L'application de cloransulam apre`s la leve´e de´truit jusqu'a`98 % de la lambourde et en diminue le poids sec de jusqu'a`98 %. L'application de chlorimuron, d'imaze´thapyr, d'imaze´thapyr additionne´de bentazon, et de glyphosate apre`s la leve´e de´truit de 49 a`90 % de la lambourde, en re´duit la densite´de peuplement de 62 a`89 % et le poids sec de 69 a9 2 %. L'application d'acifluorfen, de fomesafen, de bentazon et de thifensulfuron apre`s la leve´e de´truit de 1 a`51 % des adventices, en diminue la densite´de peuplement de 0 a`80 %, et le poids sec de 0 a`74 %, comparativement aux parcelles te´moin infeste´es. L'application de cloransulam avant ou apre`s la leve´e accroıˆt le rendement du soja de jusqu'a`79 %, comparativement a`celui des parcelles te´moin infeste´es. Compte tenu de ces re´sultats, les auteurs concluent que l'application de cloransulam avant ou apre`s la leve´e est un excellent moyen de lutte contre la lambourde dans les cultures de soja.

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