propyrisulfuron, a new sulfonylurea herbicide for rice - Wssp.org.pk

Pak. J. Weed Sci. Res., 18: 229-237, Special Issue, October, 2012 233ECHPHELOKUCYPDICYPSESCPJOSCPNRSCPPLMOOVASAGPYSAGTRLIDPYROTINCEPMIELTTRBIDTROENJA25 - 30 g a.i./ha90 - 100 g a.i./ha0 20 40 60 80 100Weed control (0 - 100, 3 - 5 WAA)0 20 40 60 80 100Weed control (0 - 100, 3 - 5 WAA)Figure 3. Herbicidal activity of Propyrisulfuron by submergedapplication. Tested plants and their growth stages atthe application were: ECHPH, Echinochloa oryzicola(2.5-leaf stage); ELOKU: Eleocharis kuroguwai (9 -10 cm plant height); CYPDI, Cyperus difformis (2-leaf stage); CYPSE, Cyperus serotinus (2 - 3-leafstage); SCPJO, Schoenoplectus juncoides (2.5-leafstage); SCPNR, Schoenoplectus nipponicus (2-leafstage), SCPPL: Bolboschoenus koshevnikovii (3 - 4-leaf stage); MOOVA, Monochoria vaginalis (2-leafstage); SAGPY, Sagittaria pygmaea (1 - 2-leafstage); SAGTR, Sagittaria trifolia (2-leaf stage);LIDPY, Lindernia procumbens (1-leaf stage); ROTIN,Rotala indica (1 - 2-leaf stage); CEPMI, Centipedaminima (1-leaf stage); ELTTR, Elatine triandra (1 - 2-leaf stage); BIDTR, Bidens tripartita (1-leaf stage);OENJA, Oenanthe javanica (at emergence). Mediansof averaged data of several tests were presented.Propyrisulfuron also controlled Echinochloa, sedges andbroad leaf weeds at 50 - 100 g a.i./ha by spray application followed byflooding 2 - 4 days after the application (Figure 4). Propyrisulfuron at27 - 55 g a.i./ha reduced the shoot biomass of Echinochloa oryzicola at3 - 5-leaf stage to under 10 % of the untreated control by the sprayapplication followed by flooding a day after application (Figure 5).