questions: asking the preventive measure against late blight of potato. 
 answers: suggested to spray indofil m-45 @ 2.5 gram per litre of water and ridomil mz-72 @ 2 gram per litre of water alternatively for 3-4 times and at an interval of 12-15 days. also suggested to take care that the lower part of the leaves should get wettened while spraying.