Our two orange trees are dying back, branch by branch. They are about 6 years old, and have so far been healthy and productive. The die-off is associated with serious peeling of the bark, in random patches, which is quickly followed by wilting leaves and then the whole branch dying completely. If it continues like this we are not far from losing the two trees completely. I've done an internet search and read about root disease (phytophthera I think) which causes bark peel of the main trunk just above ground level, but that's not our problem bcs the main trunk on our trees is OK so far. We live in Nimbin, semi-tropical, and we are at the end of a very wet summer. They are on gently sloping ground which has a clay base only a foot or two under the topsoil, which has made me think the unusually wet summer may have just left too much moisture in the topsoil which could not get away, leading to an unhealthy too wet state for the orange trees. We also have two tahitian lime trees, producing brilliantly, one of which has just a little of the same kind of die-off going on, although it is far less afflicted than the orange trees. Our two mandarine trees are not affected, in fact they are producing well. The lemon tree is also having a record production this year. Any ideas about this?