Question: query regarding management of leaf rot in coconut.  
Answer: first you have to clean the older and affected leaves from the plants and then spray hexaconazole 10 ml/liter of water or copper oxychloride 3 gram/liter of water 3 times at 15-20 days interval and also apply near the root zone by loosening the soil with the help of hand hoe. apply the recommended doses of fertilizer- urea 1200 gram, super 2 kg, potash-2kg, borax 50 gram and dry cowdung 25 kg per plant in 2 equal split dose once in the month of march/april and other in the month september/october