Question: query regarding management of leaf blight in bitter gourd. 
Answer: spray copper oxychloride (blitox-50) 3 gram/liter of water 3 times at 5 days interval in the evening time in the absence of rain. use one micronutrient as root application or  foliar spray 6 gram.liter of water 2 times at 7 days interval.for increasing the production sprays vitamins like -biovita/ mohaphol/ sagorika 2ml /liter of water @15 days interval in the evening time and to be continue up to the season end.