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DEVELOPMENT OF INSECTICIDE BASED MANAGEMENT APPROACH AGAINST THRIPS AND IRIS YELLOW SPOT VIRUS IN ONION (Pages : 1 - 7)

M.M. HOSSAIN, K.M. KHALEQUZZAMAN, M.A.A. MAMUN, M.T.R. MONDAL AND R.N. AHMED

The field experiment was conducted at Spices Research Centre (SRC), Bogra during the Rabi season of 2014-15 to evaluate the efficacy of different insecticides for the management of thrips and Iris yellow spot virus on bulb onion. Six treatments (Five insecticides + control) were replicated three times in randomized complete block design. All the insecticides performed better than untreated control treatment in reducing pest population. The insecticide Success offered best protection followed by Intrepid and Confidor. Thrips populations were positively correlated with Iris yellow spot virus in onion. The lowest number of Iris yellow spot (7.47/plant) at 85 days after transplanting (DAT) was recorded from Success 2.5SC followed by Intrepid 10SC (9.67/plant) with severity rating 2 and the highest number of Iris yellow spot (27.42/plant) at 85 DAT was recorded from untreated control treatment with severity rating 4. Maximum marginal benefit-cost ratio was recorded for Success 2.5SC (31.99:1) followed by Intrepid 10SC (28.76:1) and the least was recorded from the Actara 25WG (12.88:1) treated plots. Success 2.5SC and Intrepid 10SC may be recommended for the management of thrips and Iris yellow spot virus in onion.Download


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