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Rust colored spots on new/top growth?

by RedDog868 about January 11 - report

Does anybody know what these rust colored spots could be? They appeared overnight on my chem dog Auto (inside grow) that is 31 days into flowering, potted in a 3 gallon fabric pot with coco coir, perlite, worm castings and compost combo, feeding fox farm nutrients @ 1/4 strength twice a week, ph is good, not overwatered and has been and looks like still is growing good with fattening buds. LEDs are not to close.Like I said, it appeared overnight and does not seem to have hurt the plant just wondering what it could be. I checked grow weed easy and could not find anything other than root rot that was close what I have. Any comments or suggestions?
Answers: 7 • Score 0 • Views: 122
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  • 173

    stump 173 points - January 11

    hows your temps?

    • Score: 0
    • RedDog868
      RedDog868
      607 points -
      January 11

      Low to mid 70’s in the day, low/mid 60’s to 70 at night with humidity anywhere from 30%-70%. Like I said, her and the rest of the girls are growing great. Just not sure about the rust color and can’t find anything saying that this drain does that. Doesn’...  more

  • 988

    NugWitch 988 points - January 11

    What's your Ph at?

    • Score: 0
  • 9.033

    SanBoisLee 9.033 points - January 12

    I'd say a deficiency caused by PH issues...when your ph gets too high it causes nute block. 

    • Score: 0
    • RedDog868
      RedDog868
      607 points -
      January 12

      I will check it again but at last watering, yesterday w/ plain water it was 6.5.

    • SanBoisLee
      SanBoisLee
      9.033 points -
      January 12

      Well sir, it could be magnesium...are you doing any cal-mag at all?

    • RedDog868
      RedDog868
      607 points -
      January 12

      Ah ha, yes I have been. Even went back in my grow journal to verify the last time I gave her calmag. That’s when I discovered I have not given them a dose of Calmag in 10 days. I’ve been giving it to my clones but somehow I skipped the autos. Maybe I shou...  more

    • FREE !
      FREE !
      4.558 points -
      January 12

      If your growing in coco 6.5 is too high lower it slowly to 6.

  • 291

    Nagril 291 points - January 12

    I am stumped by the problem by the PH should be between 5.7 to 5.9.

    • Score: 0
  • 824

    bill59 824 points - January 12

    I agree with Nagril on the ph. Best to run coco a little under 6.0. Also consider a light flush to make sure salt isn't locking uptake. Like SBL asks, what about cal-mag? Coco grows usually need Cal-Mag supplement. 2.5 to 5 ml per gal. 

    • Score: 0
    • RedDog868
      RedDog868
      607 points -
      January 12

      Hey bill59 and Nagril, I’m not growing in straight coco coir but rather a compost, coco coir, worm castings and perlite mixture. I do give them calmag but after checking grow journal apparently I’ve skipped giving it to them for past week and a half. Thanks guys

  • 1.371

    Bigruss13 1.371 points - January 12

    All great answers. Possible ph problems. I’d give it a good flush. Check your ppm coming out the bottom. If you don’t water to run off every now and then you could have build up that is causing lockout or other problems. After flush feed a little calmag with ph at 6. Are u using tap water?
    • Score: 0
    • RedDog868
      RedDog868
      607 points -
      January 12

      Hey BigRuss. I water till I get run off then use the trusty turkey baster to remove it but can’t see where a flush would hurt either. I use tap water that I let set for 24 hours and then other times it’s straight from the tap to the plants. I use the same...  more

  • 7.549

    stick 7.549 points - January 12

    I had this exact issue with my Critical AF this last grow.. I gave Calmeg with Boric Acid ph'd. It stops the deficency from spreading but the existing damage you have will not be repaired. In my case we had a cold snap when the temperature dropped while struggling to get the temp up the Humidity dropped as well. 35% for 3 or more days.. This low humidity causes Boron and Calmeg deficiency...Being a Floridian dealing with high humidity and high temps, I was clueless as to dealing with low temp low humidity...Where is your humidity running?

    • Score: 0
    • RedDog868
      RedDog868
      607 points -
      January 13

      How’s it going Stick? I looked back in my grow journal and saw where I had skipped a couple Cal mag feedings. I gave Cal mag to my photos and my clones but somehow I skipped my autos.That’s the only thing that makes any sense to me. I checked this mornin...  more

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