Question: asking about control of bud rot in  coconut 
Answer: told him to apply bordeaux mixture  @10 ml/lit
prepare by adding 100g agricultural lime in 5 lit of water then separately mix 100g of copper sulphate in 5 lit of water , then mix them together thoroughly. then deep a knife in the solution if its corrodes then add more lime to the solution. then spray it to the affected part.