Relative efficacy of novaluron alone and in combination with other insecticides against diamondback moth, Plutella xylostella L.

Bioefficacy of different insecticides viz. malathion (2 ml/l), carbaryl (2 ml/l), Bacillus thuringlensis (2 g/l), azadirachtin (3 ml/l), endosulfan (2 ml/l), diflubenzuron (4 g/l) and fenvalerate (0.5 ml/l) was evaluated as alone and in different combinations with novaluron against diamondback moth larvae (3rd instar) by topical application under laboratory conditions. Five days after treatment, novaluron alone @ 0.75 ml/l provided 90 per cent mortality of diamondback moth larvae while all the combinations at full doses provided highest (100%) mortality whereas novaluron. + B.t.k (0.375 ml + 1 g/l) also gave 100 per cent mortality which is a half doses combination. However, all the remaining combinations at half doses provided more than 70 per cent mortality of larvae.