questions: query regarding leaf blight of bottle gourd. 
 answers: spray blitox 50 ec @ 2 ml/liter of water at 5 days interval. after completion of 3 spray of blitox, continue one vitamin like- mohaphol/sagorika/biovita 2 ml/liter of water 2 times @ 15 days interval  in the evening time in the absence of rain.