Use of Haloxyfop-R-methyl Ester in Onion

Abstract

The efficacy of haloxyfop-R-methyl ester [R-methyl-2- (4-(3chloro-5(trifluoro-methyl)-2 pyridyloxy)phenoxy)propionate) for annual grass weed control in onion were carried out in 2 locations at Chiang Mai Province. Herbicides were applied as postemergence at 30 days after onion transplanting. Haloxyfop-R-methyl ester at the rate more than 8.64 g ai/rai provided excellent control of annual grass weeds such as Digitaria sanguinalis (L.)Scop., Echinochloa colona (L.)Link. and Eleusine indica (L.)Gaerth. Haloxyfop-R-methyl ester at the 8.64 g ai/rai gave a control of annual grass weeds as good as fluazifop-butyl [(±) -2 [4-[[5 (trifluoromethyl)-2-pyridinyl]oxy]-phenoxy)-propionic acid)] at the rate 24.00 g ai/rai. The application of haloxyfop-R-methyl ester at 8.64-17.28 g ai/rai did not phytotoxic to onion. Use of haloxyfop-R-methyl ester for annual grass weed control in onion was able to increase yield up to 52-166% when compared to non treated plot.