Fungal attack- what kind of mildew is this???

[heirloomdaddy]

This looks like downy mildew to me....?

Am I correct? How should i handle this? This plant was thriving, but it seems like its getting hit pretty hard. New growth seems OK buts its definitely spreading. I read something in an older post by Carolyn mentioning that foliar mold can be pretty common during June gloom in CA. I'm in Los Angeles if that helps with the ID.....The mold looks more grey than white in person...not the best photos..flash seems to make it appear lighter.

thanks in advance,
matt