Herbicide Programs Utilizing Halauxifen-Methyl for Glyphosate-Resistant Horseweed (Conyza canadensis) Control in Soybean. (8th October 2018)

• Record Type: Journal Article
• Authors: Zimmer, Marcelo; Young, Bryan G.; Johnson, William G.
• Is Part Of: Weed technology. Volume 32:Number 6(2018)
• Page Start: 659
• Page End: 664
• Publication Date: 2018-10-08
• Subjects: David Johnson, Corteva; 2, 4-D, -- dicamba, -- glufosinate, -- glyphosate, -- halauxifen-methyl, -- saflufenacil, -- horseweed, Conyza canadensis (L.) Cronq. ERICA, -- soybean, Glycine max (L.) Merr.; Spring preplant burndown, -- herbicide resistance management, -- synthetic auxins; Weeds -- Periodicals; Weeds -- Control -- Periodicals; 632.5
• DOI: 10.1017/wet.2018.60
• Languages: English
• ISSNs: 0890-037X

Abstract

Abstract : Evolution of glyphosate-resistant (GR) weeds, such as horseweed, presents major challenges in no-till soybean production systems. Effective GR horseweed control with preplant burndown applications is necessary to prevent potential soybean yield losses due to competition and to manage the soil weed seedbank. Halauxifen-methyl is a new synthetic auxin herbicide for broadleaf weed control in preplant burndown applications for soybean and other crops at low use rates (5 g ae ha –1 ). Experiments were conducted to evaluate the efficacy of herbicide treatments containing halauxifen-methyl for control of GR horseweed in comparison to existing herbicide treatments utilized in no-till GR soybean systems. Glyphosate alone controlled horseweed 33%. Herbicide treatments that included halauxifen-methyl, dicamba, or saflufenacil in combination with glyphosate controlled horseweed 87% to 96%, 89%, and 93%, respectively, 35 d after burndown application (DAB). Horseweed control, horseweed density reduction, and ground cover reduction by halauxifen-methyl plus glyphosate was similar to dicamba plus glyphosate. Horseweed control was greater for halauxifen-methyl plus glyphosate than for 2, 4-D plus glyphosate. Cloransulam, cloransulam plus flumioxazin, and cloransulam plus sulfentrazone added to halauxifen-methyl plus glyphosate increased horseweed control and reduced horseweed density. No herbicide injury or soybean yield reduction was observed for treatments containing halauxifen-methyl.