Help.. *Urgent* Small black spots on underside of leaves

Fishing4life12

Active Member
Hey RIU. Im 60+ days into flower and close to harvest and I noticed black spot on the underside of the leaves, but only concentrated on all the stems (petole) and midrib. What can this be? Mold, bugs, start of root rot or bud rot? Do yhe plants get like this at end of harvest indoors?
Any help would be greatly appreciated. I dont want all this hardwork to go to waste. Thanks in advance., F4L

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