Question: query regarding control of wilt in sponge gourd. 
Answer: spray and apply copper oxychloride (blitox-50/ blue copper) 3 gram per liter of water 3 times at 5 days interval in the root zone and by covering the whole plant in the evening time in the absence of rain. after complition of this. please spray one vitamins like- mohaphol/sagorika/biovita 2 ml/liter of water at 15 days interval continously up to the end of the season.