i have had problems myself, the soil gave out with about a week left on the plants, by gave out i mean theres no useful nutes left in it, as you know i`ve tried to be fully organic this run that and been lazy and not ased feed them, so they have zinc or potasium def from the top down and its pretty severe too, hopefully i can get in there later and chop he affected plants, its only on one of the kush`s but the other didn`t look too good the other day when i was in there..
for the leaf spot... if the disease is returning after you have sprayed etc, would the spores not have formed a fungus in the soil, or even the tyoe of fungus thats like a spiders web, can`t think of the name of it, but its prevelent in boggy ground, whats yor ground like?? or is there livestock near it, maybe theres a fungus thats sporeing nearby??