Your tree is infected with fungas. Mix 1/2 cup of vinegar, 1/2 cup of sugar, and 1/4 cup of thyme with 1/2 gallon of water. Put in bottle and shake well to make sure that it is thoroughly mixed. At sunset, mist the extire tree with the mixture, repeat at least 3 times, for 3 days. The mixture will kill the fungas and the tree will love it. -Birdy