Several problems/questions

I have a few different things going on in the last week with my plant. I have a spread of really dark, kind of dirty looking leaves, and then a mix of yellow leaves. Some of the yellow leaves look like a combo of nut burn and sun burn maybe? I'm not sure. I also put a picture where I think i may have powdery mildew, I have instructions on how to "wash" it off with soap and water mixture. I just want to make sure before I do something I don't have too. This plant has been grown outdoors since the beginning of May, and is estimated at like 3 weeks until harvest, please share anything you can about these =). I add rep.

View attachment 1171168 there is a pic that points out what i think is mildew

bumpity bump bump

Do you use fert? or could be bugs

No I they only fert i put was compose dirt, pretty much all natural. I've been combing through it but haven't found anything but one caterpillar....

Looks like nitrogen & possibly phosphorus deficiency to me. I've had that purpling on the leaves too when I had root mites and the plants weren't able to uptake the nutrients. I would immediately do a foliar spray of bloom nutrients and a soil drench of Neem. If the plant starts coming around you could also do a soil drench of Thuricide. I've used that with great success to kill caterpillar type soil bugs and if you use a small amount, it will not stress the plant! Poke around the soil after dark (use a flashlight) to look for bugs.

As far as powdery mildew, look around your garden. Do other plants have it? Do your neighbors' plants have it? It's a white chalky substance. If it's nowhere else, you probably don't have it. However, if you suspect it, a light soapy foliar will do just fine and you absolutely, positively will need to shield the flower when you're spraying!!