Efficacy of Propaquizafop on Grass Weed Control in Garlic

Abstract

Three experiments were conducted in Sanpatong and Doi saket, Chiang Mai during December 1994-March 1995. The objective of the study was to determine the efficacy of propaquizafop (2-isopropylideneamino-oxyethyl(R)-2-[4-(6-chloro-quinoxalin-2-yloxy)phenoxy] propionate) on annual grass weed control in garlic. The herbicide was applied as postemergence to garlic at 28-30 days after planting with knapsack sprayer in the spray volume 80 liters/rai. It was found that propaquizafop at the rate of 10-12 g (ai)/rai provided excellent control of annual grass weeds Digitaria adscendens (H.B.K.)Henr, Eleusine indica (L.)Roem. & Shultl. and (Echinochloa crus-galli L.Beauv.) The application of propaquizafop at the rate up to 12 g (ai)/rai showed non phytotoxicity in garlic. The use of propaquizafop for annual grass weeds control could increase yield of garlic up to 24% compared with non-weeded plot.