Answer: This unusual spring has been really difficult for so many plants. Apparently some of the foliage was damaged by the cold. The browned foliage is dead and will not recover, so you could gently pull those leaves off one by one if you wish. (They will eventually drop on their own. If the leaf still has some healthy green, leave it alone so it can help provide energy for the tree.) It may take a month or so for the tree to rebuild its energy and releaf. There is not much you can do except wait and see. If you want to give it some TLC you could top dress with a thin layer of good quality compost, but there just isn't much except to hope for the best.
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