fficacy of Haloxyfop-R-methyl Ester on Annual Grass Weed Control in Potato

Abstract

The experiment was conducted in the farmer’s field at Sansai district, Chiang Mai province during December 1995-March 1996. The objective of this study was to test the efficacy of early-postemergence herbicide; haloxyfop-R-methyl ester (2-(4-(3-chloro-5-(trifluoromethyl)-2-pyridinyl)-oxy)phenoxy propionic acid) on annual grass weed control in potato (var. Spulta) to compared with propaquizafop(2-isopopylideneamino-oxyethyl(R)-2[4-(chloroquinoxalin-2-yloxy)phenoxy] propionate), fluazifop-butyl (±)-2-[4-[[5 (trifluoromethyl)-2-pyridinyl]oxy]phenoxy]-propionic acid) and quizalofop-p-tefuryl ((R)-2-[4-(6-chloroquinoxalin-2yl]-3-hydroxy-2-cyclohexen-l-one). At 48 days after potato transplanting haloxyfop-R-methyl ester at the rate of 8.32-16.64  g(ai)/rai  were treated with knapsack sprayer and hallow cone nozzle in the spray volume 60 l/rai. The use of haloxyfop-R-methyl ester at the rate of 8.32 g(ai)/rai gave excellent control of annual grass weeds (Echinochloa crus-galli, Digitaria adscendense and Eluesine indica) equivalent to fluazifop-butyl (24.00 g(ai)/rai), quizalofop-p-tefuryl (9.60 g(ai)/rai) and propaquizafop (10.00 g(ai)/rai). The application of haloxyfop-R-methyl ester for annual grass weeds control in potato could increase yield up to 9.0-23.7% when compared to non postemergence herbicide treated plot.