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Thread: Dark brown spots then dead leaf

  1. #1
    Prodaytrader's Avatar
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    Dark brown spots then dead leaf

    I have been watching these spots on my leaves for a while now. At first I thought it was because of my nutrient abuse when I tried to grow these in 3 different systems in the past month. Then I thought it was because I would sometimes splash water on the leaves and burn the plants but now I think I have a real issue. The spots are spreading to other plants and on growth after my learning curve issues. The leaves steadily grow more crusted with the spots, the leaves yellow and then they get hard and crispy. What to do?

    Ppm - 250
    ph 6.0
    water temp res - 70
    plant temp - 75
    aeroponic single tub, lower pressure misters
    Advanced Nutrients Sensi Grow 2 part fert and I use hydrozyme (30ml in 5 gallon tank)for the roots

    Anything I am leaving out?
    Attached Thumbnails Attached Thumbnails Dark brown spots then dead leaf-p1070294.jpg   Dark brown spots then dead leaf-p1070295.jpg   Dark brown spots then dead leaf-p1070296.jpg  

    Dark brown spots then dead leaf-p1070297.jpg   Dark brown spots then dead leaf-p1070298.jpg  

  2. #2
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    few more pics
    Attached Thumbnails Attached Thumbnails Dark brown spots then dead leaf-p1070299.jpg   Dark brown spots then dead leaf-p1070300.jpg  

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    Prodaytrader's Avatar
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    I just saw something about possibly this having to do with fog. Any chance this is because fog is leaking out of the tray and burning the leaves? If that's the case, no way I can do anything about it. They continue to get bigger so unless this is going to consume my plant, I guess I cant do much about it. If it is the fog then as the plant grows bigger the less of a problem this will become.

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    Weezard's Avatar
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    Fill out da form at da bottom of my sig., please.

    What kine water did you start with?

    Weeze
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    Plants do things for a reason..they don't just decide one day to get root rot or act funny. - Weedhound

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  5. #5
    Prodaytrader's Avatar
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    I started with RO water that I get at a local stand in the middle of a grocery store parking lot. The water tests at 10 ppm prior to me doing anything with it. I am unsure of the chlorine in the water but I doubt there is any since it's filtered RO water, but then again they do start with city water at those stands don't they? I think they filter for chlorine though.

    I might also add that I also have a 3 head fogging unit in the tub in addition to the 20 low pressure misters. I get these bugs where I take the fogger out and put it back in again a week later. I cant decide whether or not I want to continue to use it.

  6. #6
    Weezard's Avatar
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    Bingo!


    Your spots are cause by a calcium/magnesium deficiency.
    Add enough to the RO water to bring it to 250ppm. then mix your nutes , let it sit for a while, then test/adjust the PH.

    Don't sweat the Chlorine, or the Chloramine.
    It's actually good for the rez.
    Kills slime molds and fungus without even annoying the girls.

    The old damage is permanent but the new growth should be OK.

    2 cents, please.

    Aloha
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    Yea, I think your right. I believe others have complained before about RO water needing cal-mag.

    Is there a cheap solution at Home Depot or can I mix something up without needing to go to the hydro store to get something special?

    I just changed the water recently, can I just add in a little bit or bring the ppm's up using cal-mag at this point or am I better off changing the water? My only complaint is that every time I change the water I have to jostle the plants around and cause chaos so I'd like to avoid that again this week if possible.

  8. #8
    Weezard's Avatar
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    Quote Originally Posted by Prodaytrader View Post
    Yea, I think your right. I believe others have complained before about RO water needing cal-mag.

    I live on a volcano, there's almost 0 Calcium in my tap water.
    So?
    So I learned this the hard way.

    Is there a cheap solution at Home Depot or can I mix something up without needing to go to the hydro store to get something special?

    I just changed the water recently, can I just add in a little bit or bring the ppm's up using cal-mag at this point or am I better off changing the water? My only complaint is that every time I change the water I have to jostle the plants around and cause chaos so I'd like to avoid that again this week if possible.
    No problem, just add some CalMag to the res.

    Hmmm, I think Epsome salts are Magnesium Sulphate.

    Calcium Nitrate, CaNO3 or Phosphate CaPHO3 will supply Calcium. It take very little.

    The preceeding is just speculation. I have no real experience with anything other than CalMag.

    Best to ask some one who actually knows what alternatives work, yah?

    Aloha.
    Weeze
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    Plants do things for a reason..they don't just decide one day to get root rot or act funny. - Weedhound

    "You have the ability to move 1000 times faster than your plant, but that doesn't mean that you should." - Emilya

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    Sensibowl is offline Registered
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    Quote Originally Posted by Weezard View Post
    Your spots are cause by a calcium/magnesium deficiency.
    Add enough to the RO water to bring it to 250ppm. then mix your nutes , let it sit for a while, then test/adjust the PH.

    Don't sweat the Chlorine, or the Chloramine.
    It's actually good for the rez.
    Kills slime molds and fungus without even annoying the girls.

    The old damage is permanent but the new growth should be OK.

    2 cents, please.

    Aloha
    Weezard

    agreed....sounds like a nute deficiency...

    the new growth will be fine...eh, you live, you learn, right?


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    Ive got the same problem with my 2 plants in veg right now only mines not hydro and i got them under a 125 watt plant light. the leaves have been dieing out each time a new layer or the leaves start to grow above. all the ones die out below so now i have a 12 inch stem with a set of 2 leaves and 2 more appearing but the rott has already started on the ones on top? any suggestions?

  11. #11
    jamessr is offline Banned
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    I believe this is rust and not a nute problem. There are nute co. that sell stuff too kill the rust that attacks MJ. Advanced nutrients is one.

    good luck, just my pennies worth.

  12. #12
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    Been seeing a lot of this problem in various places on this site. I had it too, but it was because I over fertilized with P. It does look like rust, but does not have the fuzzies on the bottom of the leaves that is supposed to go with rust.

    I finally stopped giving any fertilizer except a teaspoon of 16-16-16 when they go into the flower room sprinkled on top. Since then, everything stays green with just a little yellow to the sun leaves as it should be.

    We are over fertilizing and over watering.
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  13. #13
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    You must spread the rep etc etc

    Quote Originally Posted by Weezard View Post
    Don't sweat the Chlorine, or the Chloramine.
    Ahhh the sweet voice of reason... and you don't need to adjust the pH to wash the pots out either
    Typing does not equal activism.

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    stonner2k is offline Registered
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    Quote Originally Posted by Gare0440 View Post
    Ive got the same problem with my 2 plants in veg right now only mines not hydro and i got them under a 125 watt plant light. the leaves have been dieing out each time a new layer or the leaves start to grow above. all the ones die out below so now i have a 12 inch stem with a set of 2 leaves and 2 more appearing but the rott has already started on the ones on top? any suggestions?
    so what was the out come did anymore leaves grow back or what? is there any other reasons for the leaves to go like the pics at the top of the page sorry forgot who posted them

  15. #15
    WashougalWonder's Avatar
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    It is Mg deficiency. I had same issue and used CalMag to cure it, but only 0.5 ml/gallon. Some ladies don't like lots of it and they throw nanners.
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  16. #16
    Weezard's Avatar
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    Cool Hmmm.

    Quote Originally Posted by WashougalWonder View Post
    It is Mg deficiency. I had same issue and used CalMag to cure it, but only 0.5 ml/gallon. Some ladies don't like lots of it and they throw nanners.
    I did not know that., WW
    I have seen some Phosphorus lockout when I used too much Calmag.

    But, I assumed that my last hermie was due to my neighbor's porch light.
    The bottom branches caught the light and only the bottom branches popped nanners.

    If it was the Calmag that pushed her over the edge, that's great news!
    Be a good way evoke some pollen, yah?

    Aloha,
    Weeze
    Everyt'ing: http://cannabis.com/growing/index.html
    Plants do things for a reason..they don't just decide one day to get root rot or act funny. - Weedhound

    "You have the ability to move 1000 times faster than your plant, but that doesn't mean that you should." - Emilya

  17. #17
    WashougalWonder's Avatar
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    Just a personal observation Weez. Not every species will do that, is interesting how one will consume more of a given additive than another, in some cases what is good for one is bad for another.

    I have no other data to back that up with, so not set in stone Dude.
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