Expansion of late blight lesions in relation to fungicidal spray on different potato cultivars

The observations on expansion of late blight lesions revealed that fastest lesion expansion was recorded on K. Bahar (average growth 2.67 cm²/day) followed by K. Ashoka (2.32 cm² growth/day), while minimum lesion expansion on K. Jyoti (2.05 cm² growth/day). Maximum lesion expansion was recorded in control plot of K. Bahar, K. Sutlej, K. Pukhraj and K. Jawahar, while mancozeb @ 0.2% sprayed plots showed minimum lesion expansion in all four potato cultivars. Fungicidal action was the most effective in slowing down the late blight lesion expansion.