Question: query regarding management of ant in bottle gourd plant. 
Answer: --first of all you have to destroy the  chmaber of ants in soil by loosening the soil with the help of khurpi, hand hoe etc and then application of phorate/ carbaryl/ malathion  3ml/liter of water 3 times at 5 days interval in the evening time and also spray on the affected plants also 3  times at 5 days interval in the evening time in the absence of rain.