A field study was conducted to find out the effect of different combinations of nitrogen, phosphorus and potassium levels against the severity of fungal foliar diseases i.e. late blight, early blight, leaf blotch and diseases complex and yield of potato grown in four different fertility gradient soils (low-S₁, medium-S₂, moderate-S₃ and high-S₄). Maximum yield as well as low disease

severity was observed in S₁ at N₁₅₀P₁₂₅K₁₀₀ kg ha^-1combination, S₃, at N₂₅₀P₁₂₅K₁₀₀ kg ha^-1 combination and at N₂₅₀P₁₂₅K₁₂₅kg ha^-1 combination in S₂ and S₄. This study showed that soil testing plays an important role in management of disease in potato before fertilizer application.