Maize leaves have long greyish cigar shaped spots, what blight is this?

Long, grey green, cigar or boat shaped lesions that start on the lower leaves and move upward are typical of turcicum leaf blight, also called northern corn leaf blight, which is favoured by cool, humid and cloudy weather. It survives on crop residue and spreads with rain splash, so it often appears worse in continuous maize fields. Please confirm with a photo to your KVK or agri officer, as a few other leaf blights can look broadly similar. Cultural steps that help are growing tolerant or resistant hybrids, rotating away from maize, removing or ploughing in old maize stubble, and avoiding very dense planting that keeps the canopy wet. If the disease is spreading up toward the cob leaves before grain filling and a spray is justified, recommended actives include mancozeb or a recommended triazole, but follow the label dose, the pre-harvest interval and your local KVK recommendation and rotate the mode of action. Protecting the leaves around and above the cob matters most for filling the grain.