Persimmon Leaf Fungus?

Planted a number of ordinary persimmon trees a few years ago and keep having a problem with new leaf growth. It looks like this;
http://home.att.net/~galt_57/persimmon.jpg
I try to spray the trees with a fungicide every so often but it hasn't been very effective at reducing this problem. Any idea what this is?
Thanks,
Dave in STL
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