Hi, I Have A Plum Tree, Don't Know What Kind. It Bore Fruit 2006, But Not Since Then. I Get The White Flowers And The Leaves But No Fruit. The Bark Looks Like A Fungus Is On It. It Has Tiny Air Plants Attached That I Have Been Taking Off. Have No Idea How To Treat This. Please Advise. Thankyou, Carolyn P.s. Also Have A Grapefruit Tree That Has A Small Patch Of Fungus On The Branch. In A Small Area. What To Do Before It Spreads. It Has Yummy Pink And Natural Fruits. Any Info Would Really Help As I Am A Beginner On This Subject. Thankyou