More pics

Looks like powdery mildew. There are organic and conventional sprays. I'd cut out the infected parts.

http://www.ipm.ucdavis.edu/PMG/r4100311.html

Here is a link that might be useful: apple powdery mildew

Thanks! that's what it seems to be. Looks like a localized problem.

We are entering spring here in Socal, which means less rain and moisture, so I don't think it will be a continuing problem this season.

I will cut it out for sure, and wherever it pops up again.

Clearly powdery mildew, and issue here for us in S. Calif. You can spray with appropriate fungicides specific for powdery mildew.

Patty S.