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INTEGRATED MANAGEMENT OF THRIPS TO ENHANCE SEED YIELD OF ONION (Pages : 30 - 33)

M.M. HOSSAIN, K.M. KHALEQUZZAMAN, A.H.F. FAHIM, R.N. AHMED AND M.S. ISLAM

The field experiment was conducted at SRC, Bogra during Rrabi season of 2013-14 to evaluate the efficacy of bio-rational and synthetic insecticides against thrips infestation to enhance seed yield of onion. The treatments were T1= White sticky trap @ 40 trap/ha; T2= Biopesticide-Bioneem (Azadiractin 3EC) @ 2ml/litre of water; T3= Biopesticide-Bioneem (Azadiractin 3EC) @ 2ml/litre of water + White sticky trap @ 40 trap/ha; T4= Thiamethoxam (Actara 25WG) @ 0.2g/litre of water + White sticky trap@ 40 trap/ha; T5= Alternate spraying of Biopesticide- Spinosad (Tracer 45SC) @ 0.4ml/litre of water and Bioneem (Azadiractin 3EC) @ 2ml/litre of water and T6= Untreated control. Alternate spraying of Biopesticide- Spinosad (Tracer 45SC) @ 0.4ml/litre of water and Bioneem (Azadiractin 3EC) @ 2ml/litre of water offered the lowest thrips population (1.92 thrips/ plant and 2.65 thrips /umbel). The highest percentage of thrips population (86.37% in plant and 73.76% in umbel) reduction over control was also obtained from alternate spraying of Biopesticide- Spinosad and Bioneem (Azadiractin 3EC) treated plot followed by Bioneem (Azadiractin 3EC) + White sticky trap treated plot (73.88% and 57.82%). The highest onion seed yield (383.3 kg/ha) and marginal benefit cost ratio (9.55) was also obtained from alternate spraying of Biopesticide- Spinosad and Bioneem (Azadiractin 3EC) treated plot. So, alternate spraying of Biopesticide-Spinosad and Bioneem (Azadiractin 3EC) may be recommended for effective management of thrips in seed onion production.Download


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