Influence of organic pesticides on nematode populations and seed production of centipede grass

Abstract

Applications of ethyl 4-(methylthio)-m-tolyl isopropylphosphoramidate, O,O-diethyl O-((p-(methylsulfinyl)phenyl) phosphorothioate, and O,O-diethyl S-[2-(ethylthio)ethyll phosphorotbioate effectively controlled Trichodorus christiei on centipede grass. Populations of Pratylenchus spp. and Xiphinema americanum were significantly reduced with a mixture of methanesulfonic acid, 2,4-dichlorophenyl ester and 1,2-dibromo-3-chloropropane. Ethyl 4-(methylthio)-m-tolyl isopropylphosphoramidate and O,O-diethyl O-((p-(methylsulfinyl)phenyl phosphorothioate significantly suppressed populations of Pratylenchus spp., and the latter reduced populations of X. arnericanum. Ethyl 4-(methylthio)-m-tolyl isopropylphosphoramidate and O,O-diethyl O-((p-methylsulfinyl) phenyl) phosphorothioate significantly reduced populations of Criconemoides ornatus. Increased seed production was correlated with nematode control.

Keywords: Centipede grass; Nematicides; Organophosphates; Seed production; Turf.