questions: farmer asking query regarding control of fruit fly in bitter gourd. 
 answers: in flowering and fruiting stage if this disease is occur then spray neem oil 5ml/liter of water 3 times @ 3 days interval in the evening time. 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.