Question: query regarding management of ganoderma wilt in arecanut. 
Answer: for arecanut: remove the heavily affected plants from the field and then in the pit apply 200-300 gram lime powder. spray and apply hexaconazole 10ml/liter of water or copper oxychloride 3 gram/liter of water 3 times at 10 days interval in the affected plant portion near the root portion.