I don't know. But I have four Neville's Haze x Afghani running that are all like that. They burned up like that early on in flower but the other two strains are just fine. This same strain did that last time I ran them. I tried flushing but once that burn happens there isn't much going back. The plants continue to grow ever so slowly, they are just starting week 10 bloom cycle. They have an awesome aroma though. But none of the strains are ripe yet.

So I think they are sensitive to some nutrient, not a deficiency, imo. They were fed cal-mag plus with 100% organic compost teas and nutes. The other two strains (fourteen plants) showed no overfeeding. This is my last four seeds so the question will go unanswered, for my strain.