Bioefficacy of New Formulation of Spinosad 45 SC Against Bollworm Complex in Cotton

Efficacy of spinosad 45 SC (spinosyn A 50% minimum and spinosyn D 50% maximum), a new formulation was evaluated against cotton bollworm complex along with commercial spinosad (Tracer 45 SC), indoxacarb, chlorypyriphos, cypermethrin, imidacloprid and dimethoate during Kharif 2006 at Sericulture Research Unit, Department of Entomology, M.A.U., Parbhani (M.S.). Spinosad (Spinosyn A 50% minimum and Spinosyn D 50% maximum) @ 100, 75 and 50 g.a.i., resulted in lowest incidence of bollworms in fruiting bodies and was significantly superior to indoxacarb, chlorpyriphos, tracer and cypermethrin. The lowest per cent infestation in shed material, bolls at harvest, locules at harvest due to bollworms were observed in new formulations of spinosad 45% SC 100 g.a.i./ha and its lower doses. The significant and lowest bad kapas was recorded in spinosad 45% SC 100 g.a.i./ha followed by its lower doses. It was observed that spinosad (Tracer) 25 g a.i./ha, Spinosad 50 g a.i./ha, dimethoate 200 g a.i./ha and spinosad @ 75 g a.i./ha were found to be more suitable to conserve natural enemies. The maximum seed cotton yield was (964.4 kg/ha) recorded in spinosad 45% SC 100 g.a.i./ha. Thus, spinosad 45% SC (Spinosad A 50% minimum and spinosad D 50% maximum) @ 100 g a.i./ha proved effective for the management of bollworms.