My pear trees are sick! They have some black leaves and some of the groups of strands for the flowers have turned black! One looks fine (I have two) but the other looks so sick! It looks like the leaves are dying, and the stems attached to where it bloomed are black! I'm new to fruit trees, and last year the peach trees next to these grew small fruits that never ripened, developed a fungus all over them and rotted! Any advice???