Powdery Mildew?

I'm presuming this is powdery mildew and not downy.
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I'm just rather stunned - went through a wet humid summer last year and no mildew. One humid week last week and then blowing a southerly gale for the last few days.
This is my Crepescule weeper. It's in a VERY draughty spot, full sun and I would never have dreamed it could/would get mildew! (I just haven't had mildew in the garden!)

Should I bother doing anything? If I do something... what?! Non-organic options not really an option...

Powdery mildew. I find Teas and Noisettes are particularly prone to it. Usually occurs when cold periods are followed by warmer periods or vice versa pretty quicly - in early spring in my case. I don't do a thing. Find that the teas and Noisettes are generally so vigorous that they throw it off easily espec as the weather moves to a steadier warmer state

Larry

Thanks Larry.
We have had a fairly cool Spring and then we've hit "normal" temps now. And the temp dropped markedly early this week for a day or so.
Although, I've thought it looked a little thirsty perhaps/ not 100% happy for a few weeks. I've give it some more seaweedy stuff and keep the water up to it.
33C today! Must be November... LOL

We have had a "bad" year for Powdery mildew. Its cleaning up now. Usually gone by end of November