Nematicidal activity of O,O-Diaryl O-Ethyl Phosphorothionates against Meloidogyne incognita

Twenty one O,O-diaryl O-ethyl phosphorothionates having different sustituents in the phenyl ring were tested in vitro for nematicidal activity against root-knot nematode, Meloidogyne incognita. Out of these, eight which showed good activity, were evaluated under glass house conditions on cowpea. These compounds had considerably increased the plant growth characters and significantly reduced the number of galls on the root system. O,O-Diphenyl O-ethyl phosphorothionate showed the highest activity in vitro (LC₅₀=161 g/ml) and also highly decreased the galls besides significantly increasing all the plant growth parameters of cowpea at lower concentration i.e. 1251g/ml. Its nematicidal activity was found better than triazophos, a standard nematicide.