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Marijuana Plant Problems

Mystery Spots: Please Help Identify!

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forums; I have some Kali Mist seedlings — about 3 weeks old — in my DWC cloner, and they've started developing ...
  1. 06-14-2012, 09:19 AM #1
    MisterWhilom
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    Default Mystery Spots: Please Help Identify!

    I have some Kali Mist seedlings — about 3 weeks old — in my DWC cloner, and they've started developing some markings that I've not been able to reliably cross-reference by looking at pictures of diseased leaves.

    Here's one plant, first a wide shot and two tight:
    Image00001.jpg Image00002.jpg Image00003.jpg

    Here's its neighbour:
    Image00004.jpg Image00005.jpg Image00006.jpg

    The burn on the second plant looks like a toxicity of some sort, but the white speckling is a mystery to me. Toxicity? Deficiency?

    Data on the environment and gear:

    Air temperatures: 76-88F daytime; 71-76F nighttime (active cooling is my next planned upgrade)
    Relative Humidity: 27-55%; I have a humidifier to help on the dry days
    Cloner: 20L, 13-site DWC
    Lighting: T8, 60cm; 4 × 18W; Magnetic ballasts
    Water temperature: ~76° - 80°
    Water: Reverse Osmosis; 72-80 µS1 (740-ish µS at the tap)
    Reservoir EC: ~500µS
    Nutrients: FloraMicro/Bloom using Lucas Formula; RootJuice
    pH: Stable, 5.5 - 6.2

    I'm'a change my res water and see if the problem clears up, but I hope that in the meantime one of the leaf-reading gurus here will be able to diagnose the problem.

    Thanks for reading!


    MW

    notes:
    1. Corrected to "µS" from "ppm"
    Last edited by MisterWhilom; 06-15-2012 at 03:41 AM. Reason: Typos
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  2. 06-14-2012, 02:20 PM #2
    Dr Kynes
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    why you using a flowerin nutrient mix on those lil plants? give them more nitrogen and less phosphorous and potassium. if them was tomatoes i would say its potassium burn, and nitrogen deficiency. untill they start budding or fruiting, too much p and k can hurt your plants. clear yur reservoir, and refill with a 1/2 str mix of veg nutrients with micro nutrients and see if they dont set better growth. that one really badly burnt leaf should be removed.
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  3. 06-14-2012, 02:25 PM #3
    crazyhazey
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    everything the doctor said, look under those leaves and make sure it aint mites.
    im on riu mostly during the outdoor season, so PM to get in contact, posts could take longer for a response but ill check in when i can.

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  4. 06-14-2012, 03:23 PM #4
    Coho
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    RO water..do you add calmag+?
    Have a great one. Advice is for folks with a legal grow and worth what you paid for it.
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  5. 06-15-2012, 02:27 AM #5
    MisterWhilom
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    Quote Originally Posted by Dr Kynes View Post
    why you using a flowerin nutrient mix on those lil plants?
    Good point!

    My understanding is that the Lucas formula is a full-cycle nutrient, and accounts for the nitrogen balance in the solution.
    I'd figured that with a low EC (~550 µS) I might encounter some deficiencies but I didn't think I'd burn anything.

    Shows what I know.

    I'm gonna try reducing the ratio of FloraBloom to FloraMicro.

    I clipped the burned leaves right after I snapped those photos.


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    Last edited by MisterWhilom; 06-15-2012 at 02:40 AM.
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  6. 06-15-2012, 02:31 AM #6
    MisterWhilom
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    Quote Originally Posted by crazyhazey View Post
    everything the doctor said, look under those leaves and make sure it aint mites.
    I apply a neem oil solution regularly and inspect just as frequently.
    I'd be surprised if any pests got through.

    Good thought, though.
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  7. 06-15-2012, 02:36 AM #7
    MisterWhilom
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    Quote Originally Posted by Coho View Post
    RO water..do you add calmag+?
    Where I live we have, if anything, an excess of minerals in our tap water.
    My best-case RO scenario is a reduction from ~740 µS1 to 72 µS1, of which the remaining parts are (judging by the buildup in my kettle) primarily calcium.
    I take that 72 µS1 into account when I calculate my EC.


    notes:
    1. Corrected from "ppm" to "µS"
    Last edited by MisterWhilom; 06-15-2012 at 03:46 AM.
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  8. 06-15-2012, 02:39 AM #8
    lahadaextranjera
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    Yes but I think u need 100 ppm min of Ca. I add EC 0.1 of Ca and also Mg EC 0.1 to buffer mine OR I use tap water to EC 0.2.

    Ferts are designed for tap water users and have some Mg and Ca in them.
    http://www.rollitup.org/members/laha...st-grow-27214/
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  9. 06-15-2012, 02:39 AM #9
    lahadaextranjera
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    my tap is ec 0.45 and i get ec 0.0
    http://www.rollitup.org/members/laha...st-grow-27214/
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  10. 06-15-2012, 03:18 AM #10
    MisterWhilom
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    Quote Originally Posted by lahadaextranjera View Post
    Yes but I think u need 100 ppm min of Ca. I add EC 0.1 of Ca and also Mg EC 0.1 to buffer mine OR I use tap water to EC 0.2.

    Ferts are designed for tap water users and have some Mg and Ca in them.

    True, I'll mess with adding some tap water back into the solution to get my Ca & Mg.
    Where did you get the 100 ppm figure?


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