"Rust" spots on leaves

Discussion in 'Marijuana Plant Problems' started by brotherjericho, Jul 17, 2012.

  1.  
    brotherjericho

    brotherjericho Well-Known Member

    I've got two reg Nepali Rukum plants that are 20 days above soil under a 150w 4000k CMH. One of the plants has some odd rust colored spots on some of the leaves. The spots are not on the leaves from the first node, but they are mostly concentrated on the 2nd node leaves. The third node (last, topped above there) has some loss of color as well, not quite as spotty. I've looked at several of my links for plant problems and can't quite nail this one down. I'm thinking Mag deficiency, I recently top dressed with some Epsom Salts to try to arrest the spread.

    Plant: Holy Smokes Nepali Rukum
    Age: 20 days above soil.
    Lighting: 150w 4000k CMH
    Growing Medium: Mixture of peat, worm castings, perlite, vermiculite, and calcitic lime (when the spots showed up, just transplanted to new soil today)
    Water: tap that sits for several days, adjusted pH of 6.4-6.7

    The other Nepali Rukum does not have the same spots and is exactly like the above.

    NRukum1-1.jpg NRukum1-2.jpg NRukum1-3.jpg NRukum1-4.jpg NRukum1-5.jpg
  2.  
    VICTORYGARDENSHYDRO

    VICTORYGARDENSHYDRO New Member

    start looking for mites
  3.  
    brotherjericho

    brotherjericho Well-Known Member

    That's the first thing I did, checked out the leaves thoroughly with 40x, no mites that I could see. It does not appear to have gotten any worse since I've added the epsom salts about three days ago, looked pretty much like my pics above.
  4.  
    majek

    majek Well-Known Member

    Looks like calcium deficiency but I'm not positive. keep giving them light doses of epsom for a few days and see if they recover.
  5.  
    mrpeoples

    mrpeoples Active Member

    mag overdose can lock out calcium .... beware of over doing the salts
  6.  
    brotherjericho

    brotherjericho Well-Known Member

    Yeah, it was only a small dose. I just transplanted them today into new soil that has dolomitic lime in it, so cal-mag should be good. The lime I used for the starting mix was calcitic, very little magnesium.
  7.  
    brotherjericho

    brotherjericho Well-Known Member

    Well whatever it is, the other NR plant has it now too. Gonna dose with some epsom salts next watering. I think whatever it is is pretty specific to this strain, none of my other plants in the same space are showing any signs of the issue.

    I can't find where anyone else has posted anything about this particular strain on the Net yet.

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