Evaluation of spinosad 45 SC (Spinosyn A 50% Minimum and Spinosyn D 50% Maximum) against bollworms complex in cotton

摘要

Efficacy of Spinosad 45 SC (Spinosyn A 50% Minimum and Spinosyn D 50% Maximum), a new formulation from DeNocil India Limited, was evaluated alongwith commercial Spinosad (Tracer 45 SC), indoxacarb, chlorpyriphos and cypermethrin during ttan/2004 and 2005. Spinosad (Spinosyn A 50% Minimum and Spinosyn D 50% Maximum) @ 100, 75 and 50 g a.i. resulted in lowest incidence of bollworms in intact and shed fruiting bodies and was significantly better than chlorpyriphos and cypermethrin and on par with Tracerand indoxacarb. On the basis of damage in pickable bolls, the loest damage was recorded in Spinosad (Spinosyn A 50% Minimum and Spinosyn D 50% Maximum) @ 100 g a.i./ha i.e. 2.85 and 1.36 per cent on boll and loculi basis, respectively, which was on parwith its respective lower dosages, Tracer and indoxacarb and significantly lower than chlorpyriphos, cypermethrin and control. The maximum seed cotton yield (24.44 q/ha) was also recorded in Spinosad 45 SC (Spinosyn A 50% Minimum and Spinosyn D 50% Maximum) @ 100 g a.i./ha. No resurgence of sucking pests was observed with this insecticide. Thus, Spinosad 45 SC (Spinosyn A 50% Minimum and Spinosyn D 50% Maximum) @ 100 g a.i./ha proved effective for the management of bollworms.