Bonsai Beast, I assume your tree has not begun to flower in your area. You can apply low biuret urea if the bloom has not yet started. It would have been better if you had sprayed 1.5 to 2 months prior to expected bloom date, but a late spray will still be better than no spray. Then after your trees bloom, new fruitlet set, and the early drop period (where the tree drops some of the small fruit that it set) a second urea spray should be given.