Question: asking about control of caterpillar infestation in bittergourd 
Answer: caterpillars can be controlled by spraying malathion 50 ec 2ml/lit or rogor ,tara 909(dimethoate) 30 ec 2ml/lit at 5 days interval for 3 times.do not use ddt, copper and sulphur dust, as these are phytotoxic.