I've been having this problem mainly since I gave this Medicine Man it's first feed, so am wondering if it's to do with overfeeding - the rust mainly seems to develop by the veins, and I spot some browning at the leaf tips. It's day 8 of flowering, and the plants was fed 1ml grow + 1ml/bloom last Thurs, although the browning has been about for a few weeks.
I've been spraying with Citrofresh for the past week, and removed the bottom leaves where the rusting was worst... I've just sprayed with it again, hence the wet leaves!
The ventilation is the same as I've had for the previous 2 grows, neither of which developed any problems - plus, all the intakes have filters with bactericide.
Any ideas?

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