My orange tree had a case of red spider mites, causing about 50% leaf drop. After about a month I feel I have gotten them to vacate my tree. What I am left with is a sad little tree. The leaves are yellow with brown edges. I've been told that it should come back to its former glory, that I should just be patient with it. I am not sure what to do I have had this tree for years and has given me orange blossoms and small oranges