I have a Prairie Fire crabapple tree that is 10 years old and approx. 15 ft tall. The tree is next to our deck and swimming pool. The tree drops its leaves early in the summer until fall. The dropping of the leaves are bothersome in the summer by blowing into the pool. The leaves are discolored and looks to have a fungus problem. Is there a systemic solution I can pour around the trunk so the tree can pull the solution up in to the tree structure and help the infected leaves for next year's growth?