Control of common cocklebur (Xanthium strumarium L.) with pre- and postemergence herbicides in soybean

Abstract

]. 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.

Effect of Competitive Abilities of Some Soybean Genotypes, Plant Densities and Weed Control Treatments on Soybean (Glycine Max L.) and It's Associated Weeds.

“…Abdel -Hamid and El-Metwally (2008) and Sikkema et al (2008) found that the fresh and dry weights of weeds were significantly reduced by using pre-emergence herbicides. Concerning post-emergence herbicides, Sikkema et al (2008) reported that application of post-emergence herbicides reduced dry weight of weeds especially the season weeds, either brod-leaved or grassy weeds in soybean fields.…”

“…Abdel -Hamid and El-Metwally (2008) and Sikkema et al (2008) found that the fresh and dry weights of weeds were significantly reduced by using pre-emergence herbicides. Concerning post-emergence herbicides, Sikkema et al (2008) reported that application of post-emergence herbicides reduced dry weight of weeds especially the season weeds, either brod-leaved or grassy weeds in soybean fields. With regard to herbicides combinations, either as pre-or post-emergence only, or pre + post-emergence combination, several researchers, indicated that the herbicides combination were more effective for weed control in soybean than individual herbicide applications ( Sarah et al 2002;Reddy et al, 2003 andSaudy andEl-Metwally, 2009).…”