Clmchenry i've had something similiar, but not to this extent happen to a few of the bottom fan leaves of a couple of my girls. I accidentally hit them with my nute solution while watering them, and ended up with whitish/brown spots. Luckily for me this was in veg, and nothing came of it...as new growth wasn't affected by it. If you're feeding a half strength solution, nutes shouldn't be the problem, they could be burned like was mentioned earlier. Just to be on the safe side, i'd tone down the nutes to 1/4 strength or even just water and only water for a few feedings. I hope this doesn't affect your harvest too much. Peace and love bromosexual
-Ex