Bubba kush

I believe you have pests....may be spider mites or thrips. Can you take a closer picture and check the underside of your leaves for little critters.

Toxicity. Clawing leaves, most probably nitrogen. But i see some magnesium too, could be aftermath of first, could be wrong ph and absorbing issues. Could be watering regime wrong or she is in lockout and you spoiled her that way. In soil - plain water , phed to 6.3, dechlorinated, for 3-4 cycles at least. Wet/dry cycle is a must too. If she is in lockout top lair can dry out, but bottom will stay full, only lifting pots will tell you when to water. I saw plants returning from way worse. Just back off !!!! Watch ph and all should go better.

This is a case. Of thinking giving more, will produce more. Its a common misconception with new growers. Even growers with a few grows under their belt. Less is more when starting and continuing through your grow. Enzymes are key with soil. Good dry additives make things easier. npk is key to any controlled grows. So is micro nutrients. But, only in small doses. A plant shouldn't have to exceed 600ppm NPK depending what stages its in.

This is burning from feeding too much or too often.......or both. The solution is simple.....feed less. More details in your diaries would make giving targeted advice much easier.

Nitrogen toxicity. Are you still feeding veg nutrients? What I would do in your situation is just water her with Lactic acid bacteria at this point to help her break down the nutrients you have built up if you're using organic. If not I would water her with some Cleanse from Athena to break down the salt build up in your soil. Water until you see run off for the next week or two and she should show some improvement. You have to get some of that Nitrogen out of there if possible...

Oh yeah, my initial answer error'd out so i lost it and had to re-write it from memory. I saw the powdery mildew comment and i remembered what i said before. It wasn't about powdery mildew. To me, it more looks like calcium dust from using hard water in a humidifier. Powdery Mildew looks different than that as i recall. I've not had PM in like 25 years.

I couldn't find the diary associated with these pix. I was trying to see what your medium you are growing them in is. If it's soil i would suggest start watering without nutrients for a bit. Just pH to 6.2 your water and water when it needs to be watered. aka, when your pot feels light. LIGHT!!! From where i'm sitting that plant is suffering from toxic soil, oxygen deprived roots, and out of range pH. You need to water with 6.2 pH water only for awhile. And do your best to get your temperature and humidity in the best possible range you can. 72F and 50% humidity.

You got powdery mildew going on likely because the plants are unhealthy, PH fluctuations are evident with the rust color section in between the leave segments, calcium and magnesium deficiency...Theres is a lot going on, likely would be better off starting over, cleaning the area with soap and water then bleach and water and then peroxide to kill the mildew...This are beyond unhealthy