Broad-leaved Weed Control with Combination of Halauxifen-methyl with Florasulam or Fluroxypyr in Wheat

Halauxifen-Based Broad-leaved Weed Control

Abstract

Field experiments were conducted to determine the effectiveness of combination of halauxifen-methyl with either florasulam or fluroxypyr-methyl for control of diverse broad-leaved weed flora in wheat (Triticum aestivum L.). In first experiment, the bio-efficacy of a premix of halauxifen-methyl + florasulam at 7.66 (3.91+3.75), 10.21 (5.21+5.00) and 12.76 (5.51+6.25) g/ha, applied with and without surfactant, was evaluated and compared with carfentrazone (20 g/ha) and metsulfuron (4 g/ha). In second experiment, premix of halauxifen-methyl + fluroxypyr methyl at 160.4 (4.8+156.6), 200.6 (6.1+194.5) and 240.66 (7.3+233.4) g/ha, along with halauxifen-methyl (7.3 g/ha), fluroxypyr (233.4 g/ha), metsulfuron (4 g/ha), metsulfuron + carfentrazone (5+20 g/ha), hand weeding, and an untreated control were evaluated. Halauxifen-methyl alone was poor for control of Rumex dentatus. However, combination of halauxifen-methyl and florasulam at 10.21-12.76 g/ha and halauxifen-methyl and fluroxypyr at 200.6-240.66 g/ha effectively controlled the diverse broad-leaved weed flora (Rumex dentatus, Medicago denticulata and Coronopus didymus). The efficacy of halauxifen-methyl + florasulam was better when applied along with surfactant. Halauxifen-methyl + florasulam at 10.21 g/ha along with surfactant was superior to metsulfuron methyl 4 g/ha and carfentrazone 20 g/ha. Halauxifen methyl + fluroxypyr methyl had similar efficacy as the standard treatment metsulfuron + carfentrazone combination at 5+20 g/ha. Studies clearly indicated effectiveness of halauxifen-methyl + florasulam and halauxifen-methyl + fluroxypyr-methyl for control of diverse broad-leaved weed flora in wheat and these treatments resulted in 30.9-77.9% higher wheat grain yields compared to weedy control.