Question: asking about control fo bud rot in coconut 
Answer: recommended to spray copper oxychloride (blitox 50)@2gm/l water , 3 spray at 5 days interval

also during offset of monsoon , apply brodeaux paste -100gm copper sulphate and 100gm lime in 500ml each and mix well. then mix the two solution together to make a 1 litre paste then apply on the bud portion.