Potato (Solanum tuberosum L.) is a very important food and cashcrop. The variety Kufri jyothi was evaluated for late blight of potatocaused by Phytophtora infestans for disease progress and yieldpotential with the application of fungicides viz., dimethomorph(1.0 g/lt), azoxystrobin (23 per cent) (1ml/lt), fenamidon+mancozeb(3gm/lt), equation pro (1ml/lt), cymaxanil+ mancozeb (3gm/lt),potassium phosphonate (3ml/lt), propiconazole (1ml/lt) andmetalaxyl+ mancozeb (1.5gm/lt) was used as a control under fieldconditions during the main cropping rabi season in 2011-2012 and2012-2013. The experiment was conducted in randomized completeblock design. Fungicide applications in fifteen days intervals wereestablished. Late blight infection was prevalent in the experimentalyear, and a significant amount of disease was detected (P<0.05).Application of fungicides considerably reduced late blight progress,with a corresponding increase in yield of potato. Among the differenttreatments, azoxystrobin (23 per cent) (1ml/lt) fungicide treated againstpotato found to be highly effective with (PDI 13.63 per cent), followedby fenamidon+mancozeb (3gm/lt) (PDI 24.50 per cent) and cymaxanil+mancozeb (3gm/lt) (PDI 25.17 per cent). But propiconazole (1ml/lt)was found to be least effective with (PDI 76.00 per cent). The highestyield was obtained by the application azoxystrobin (23 per cent)(1ml/lt) (127.70q/ha), followed by fenamidon+mancozeb (3gm/lt)(119.05q/ha).