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ABSTRACT: An experiment was conducted at Lac Research Station at Nachole of Chapainawabganj district during July to October 2017 and 2018 which is kartiki lac crop season to evaluate botanical and biochemicals against two voracious lac predators Eublemma amabilis and Pseudohypatopa pulverea following RCB design. The highest reduction of lac predators, E. amabilis (79.1-80.6)% and P. pulverea (74.8-75.0)% was found when Sprayed with Neem seed extract @ 10g crushed seed/litre of water followed by Azadirachtin (Bio-neem plus 1EC) @ 1.0 ml/ litre of water and Spinosad (Success 2.5 SC) @ 1.2 ml/liter of water. Percent survival of lac insect was increased by applying biopesticides for the control of predators with the highest 28.5 and 29.6% survival at LRS and Nachole respectively, in Neem seed extract treated plants. Yield of lac was increased by 15.4-29% at LRS and 17.4-28.1% at Nachole over untreated control indicating that use of biopesticides successfully reduced the infestation of two dangerous predators in the crop field resulting in increased lac yield and the highest lac yield (6.7 kg/plant at LRS and 6.2 kg/plant at Nachole, respectively) was recorded in Neem seed extract treated plants.
Keywords: Lac, predators, management, insect survival, scrapped lac, lac yield
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