Question: query regarding management of fruit rot and drop in bottle gourd. 

Answer: --at first spray borax/ micronutrient mixture 6 gram/liter of water 3 times @ 7 days interval in the evening time.after completion of 3 spray of borax, continue one vitamin like- mohaphol/sagorika/biovita 2 ml/liter of water @ 15 days interval up to the end of the season in the evening time in the absence of rain.