>>2454206>powdery mildewFrom a quick google, that looks like it may be it.
I'll do some reading on prevention and possible treatments, it's getting colder anyways and harvests have gotten slower, so I am not too sad about it, even if I can't save them. As I said this is my first year growing shit and I learned a shitton, including how to get rid of aphids, this is just another thing I can learn about now so I know better in the future (so next year).
It's my bad anyways, I had a phase where I didn't water enough, stressing the plants out, resulting in first the aphids and now this.
Anyways, thanks already anon, I had no idea how to ID this stuff.