Leaf rust is caused by fungus and leaf spot by bacteria. In SPNF, for both these problems we manage the problem using sour buttermilk as a foliar spray. Sour buttermilk will inhibit the growth of fungus and/or bacteria on the leaf surface. Also, it acts as a natural growth promoter and helps the plant recover from the effects of the disease.
For 1 acre foliar we need 200 liters of water. To this add 6litres of sour buttermilk and spray well to coat the surface of the leaf. Adjust the proportion of foliar spray required based on the area you want o spray.