Hi there We have come to live with leaf curl in the organic orchard. These leaves will fall off eventually and new healthy leaves will grow. Spraying with copper is considered a good preventative but we feel it can do damage to the soil fungi and bacteria. The leaf curl is a spore and if you put a mat (old carpet or a tarpaulin) under the tree in early spring, it can prevent the spore from reaching the tree when it rains. If the tree is strong and healthy, the leaf curl will not affect its ability to fruit well.