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After 2 years of searching the net for answers, I can't find a definitive cause for this "purple". I'm ready to start looking for testing labs. I have 2 friends growing the same clones. Both have leaf hoppers, same soil and nutes, one spot is fine and the other has purple new growth. Only 5...

I would still like to see or hear about test results, but overwatering might actually be it. Would like to hear from some of last years' posters to see what they think about this. Maybe along with certain temps or genetics? My friends with this problem replaced all old mix with new Pro Mix this...

I'm not sure I've read that anybody has tried, and we haven't yet, not sure what the best product to try is.

Yes it is crazy. My best guess is that a certain tree species has a disease that spreads via leaf hoppers, thrips or aphids, only spreading to plants nearby. But the wide spread of cases and the fact we all have leaf hoppers up here but only some have purple has me stumped.

Yes, I saw many leaf hoppers when I looked at them last year and have tried to convince my buddies that this must be the problem. This year they sprayed Sevin on surrounding brush to knock them down but I don't think it's helping. Several miles away, on another hillside, my other buddy is...

Good question, I think I've read it's in Hawaii, so I'd imagine it's there. When cash crops get affected, there will be tests done for sure. I'm not sure the results would be shared with the expense of the testing though.

My buddies have tried everything, completely changed soil and added new nutes. Indoors they're fine. I guess no one has had this tested by a plant pathologist yet? We're in the northeast, on our third year of this "purple".

Been looking for an answer to this, showed up in a few grows around here. I read the entire other thread. Is phytoplasma still the prevailing theory?