questions: telling that he has sprayed ridomil mz-72 as a preventive measure against late blight of potato but has not seen very good results. asking the remedy for the same. 
 answers: suggested to spray indofil m-45 @ 2.5 gram per litre of water after 12 days from the last date of sprayed ridomil mz-72 solution and then again ridomil mz-72 @ 2 gram per litre of water after 12 days i.e to spray alternatively at an interval of 12 days for 3-4 times.also suggested to take care during sparying so that the lower part of the leaves also gets wettened.