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Abstract
Field efficacy of some new molecules were assessed against diamondback moth on cabbage during rabi season in 2014-15 and 2015-16 at “In Check Farm”, C-Block, B.C.K.V., Kalyani, Nadia, West Bengal. The maximum number of larval population was recorded during first week of March, 2015when minimum and maximum temperature was 16.83°C and 33.16°C respectively while minimum and maximum relative humidity was 42.57% and 80.29% respectively. Similarly for the second year, maximum number of larval population was recorded during second week of March, 2016 when minimum and maximum temperature was 15.74°C and 35.28°C respectively while minimum and maximum relative humidity was 41.37% and 82.36% respectively.Then in both the years, gradually the larval population decreases gradually and reaches its minimum population strength during last week of March.In both the years, larval population of Diamondback moth is positively correlated with the temperature (max. and min.), rainfall and sunshine hours. Among all the insecticides, a ready mix formulation of Novaluron(5.25%SC) + Emamectin(0.9%SC) 925ml/ha shows highest mortality i.e. 93.28% and 92.54% respectively in the year 2014-15 and 2015-16.