it's called "Peach Leaf Curl" or "Peach Curl" and you can google it to find cures. i believe you have to spray fungicide (natural or chemical) all over the branches and trunk during the winter when they're dormant and make sure all trimmings and leaves that have fallen are taken away from the base of the tree and destroyed. double check though. pruning out the "middle" of the tree will increase air circulation and will help make sure there isn't a good environment for the curl to come back.

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1985 300D - 1984 Euro 280E AMG Clone (SOLD) - 1978 280CE (SOLD) - 1983 300D (SOLD) - 1981 300D (SOLD)