Question: asking about control measure of leaf blight of coconut. 
Answer: --clean the plant first , then apply borax solution 5gram/liter of water near the crown portion, then next day apply hexaconazole 10ml/liter of water or blitox 50/liter of water near the crown potion. apply recomended doses of fertilizer urea-600 gram, ssp 1kg and mop 1 kg along with 15-20 kg of dry cowdung per plant in ring method 1.5 meter away from the plan.