Question: asking about control of blight of potato

Answer: spraying of saaf /companion as directed earlier 
irrigation:
the furrow method of irrigation has to be adopted. three irrigation has to be adopted. three irrigations should be applied, first at 25 days (stolen formation stage), second at 60 days (tuber formation stage) and third at 80 days (tuber formation stage) after emergence or sprouts. in case of application of mulching materials in furrows, only two irrigations are to be applied at 25 and 60 days after emergence of sprouts. at the time of application of irrigation care should be taken not to submerge the ridges completely.