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Thread: Orange rust spots on older leaves (pics)

  1. #1
    New Member brettweir's Avatar
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    Orange rust spots on older leaves (pics)

    Hey guys, I'm doing my second CFL grow and already I'm experiencing weird stuff with my one plant. I'm growing Joey Weed's White Russian and what started was the older leaves began getting these orange, almost rust-like spots on them. The seedling was transplanted into this soil about 2 1/2 weeks ago. I started giving it 1/2 doses of General Hydro's Flora Series nutes about a week ago.

    The pH in the soil is about 6.8 or 6.9, there's plenty of drainage, and the plant seems to be growing fine on its own. The old leaves are the ones that are showing the most rust but new leaves that grow out however also get this orange rust crap on the tips after about 2 days.







    Any ideas? I'm suspecting either overwatering or rust fungus. I hope it's not the latter..

  2. #2
    420 Member FreakNature's Avatar
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    Re: Orange rust spots on older leaves (pics)

    Looks like nutrient lockout or a deficiency of some sort:
    Cannabis Plant and Pest Problem Solver - Pictorial

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    420 Member Racefan's Avatar
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    Re: Orange rust spots on older leaves (pics)

    rust explained.

    --------------------------------------------------------------------------------

    rust, how many of you have had this and been beaten by it? lots i bet!!!
    first, rust is a fungi. it is opportunist. it preys on unwell plants. if something is a miss, rust is a sign. rust has been identified to have 7,000 species. it attacks crops of every description. but we're only interested in one variety arn't we?
    if rust is present early in a grow, you have problems as it's an indicator something in your room is a miss. usually ventilation. go through your system and double check things are in place and working properly.
    rust is an air borne fungi. if given the opportunity, it WILL take hold. it usually does during flower as this is when the plants immune system is at its weakest as its energies are concentrating on re-production, not survival.
    depending on what part of the grow you get it, you can cure/minimize it with either chemical or natural remedies.
    it enters the leaf via the stomata and then it's off and running.
    fungacides used are generally copper based and include; thriram, manzecob, maneb or zineb at 10 day intervills.
    organic;
    baking soda, 1 tea spoon/ quart of water. spray on.
    copper sulphate, read lables.
    fungacidal soap sprays;
    garlic sprays, 1/2 cup minced garlic, 1 quart of water. let sit 24hrs, strain, spray.
    sulphur, one of the best natural sprays. it is low in toxicity.
    micro kill, a citric based killer. i use this with great success

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    Re: Orange rust spots on older leaves (pics)

    is this the same?



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    420 Member McBudz's Avatar
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    Re: Orange rust spots on older leaves (pics)

    ^ That possibly looks like mite damage. Take a real close look at both side of the leaf. Look for tiny tiny little dark specs that might even be moving.

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    420 Member MagicCannabus's Avatar
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    Re: Orange rust spots on older leaves (pics)

    Look at how dark and leathery the leaves are guys. They don't have mag or nitrogen deficiency. What part of the plant is it on? Top? Bottom? Middle? That is very important to know.... you say older leaves so I am guessing lower down. It's probably nutrient lockout of some kind as mentioned before. Probably from giving them too much nitrogen.

    Bare minimum, flush the soil and check pH. Should be from 6.2-7

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    Re: Orange rust spots on older leaves (pics)

    i got it on the middle of my plant on the fan leaf its only on one leaf now but i see a little starting to form on another fan leaf

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    420 Member McBudz's Avatar
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    Re: Orange rust spots on older leaves (pics)

    Quote Originally Posted by weedmang View Post
    i got it on the middle of my plant on the fan leaf its only on one leaf now but i see a little starting to form on another fan leaf
    pics?

    Also follow the advice from the post aboce yours, Flush and verify pH is correct. What have you been feeding and how much for the last 3 weeks?

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    Re: Orange rust spots on older leaves (pics)


    Last edited by Happy Kitty; 07-14-2012 at 10:18 PM.

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    420 Member Busta22's Avatar
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    Re: Orange rust spots on older leaves (pics)

    I have the exact same problems hope some people can come up with some soultions, the flushing help, better signs in the foliage 3 days after flush

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    Re: Orange rust spots on older leaves (pics)

    Classic problem. Hard to diagnose. I've had the same problem for five months now. I'm harvesting today, and things look pretty good.

    I'd love to have an idea what the problem is. I know with me, it's not PH of the soil or water. It's also not a nute lockout.

    I'll agree with Racefan that it might be mold. That's the last thing I troubleshooted and so I sprayed. Didn't get better, but it didn't get worse.

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    Re: Orange rust spots on older leaves (pics)

    Quote Originally Posted by Racefan View Post
    rust explained.

    --------------------------------------------------------------------------------

    rust, how many of you have had this and been beaten by it? lots i bet!!!
    first, rust is a fungi. it is opportunist. it preys on unwell plants. if something is a miss, rust is a sign. rust has been identified to have 7,000 species. it attacks crops of every description. but we're only interested in one variety arn't we?
    if rust is present early in a grow, you have problems as it's an indicator something in your room is a miss. usually ventilation. go through your system and double check things are in place and working properly.
    rust is an air borne fungi. if given the opportunity, it WILL take hold. it usually does during flower as this is when the plants immune system is at its weakest as its energies are concentrating on re-production, not survival.
    depending on what part of the grow you get it, you can cure/minimize it with either chemical or natural remedies.
    it enters the leaf via the stomata and then it's off and running.
    fungacides used are generally copper based and include; thriram, manzecob, maneb or zineb at 10 day intervills.
    organic;
    baking soda, 1 tea spoon/ quart of water. spray on.
    copper sulphate, read lables.
    fungacidal soap sprays;
    garlic sprays, 1/2 cup minced garlic, 1 quart of water. let sit 24hrs, strain, spray.
    sulphur, one of the best natural sprays. it is low in toxicity.
    micro kill, a citric based killer. i use this with great success
    This was so good I copied it to a text file on my desktop.

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    Re: Orange rust spots on older leaves (pics)

    I'm not sure if it applies to you, but you can get this type of damage from smoking cigarettes around your plants as well. While the carbon dioxide might be good for the plant, the tar and nicotine clog up the pores in the leaves limiting the amount of gas they can take in and expel. If you smoke near the plants, stop. It might solve your problem.

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    420 Member Stormycirca65's Avatar
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    Re: Orange rust spots on older leaves (pics)

    Racefan is 100% spot on. "Rust" is a fungi that presents itself as a nute lock out or nute burn problem, but it's actually a ventilation problem. The air in your grow space is not being replaced well and efficiently enough. This is usually a situation that involves inadequate exhaust, over abundant intake, and high humidity. Stagnant air and high humidity. Insects love this, plants do not.

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    420 Member Scarfinger68's Avatar
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    Re: Orange rust spots on older leaves (pics)

    Quote Originally Posted by McBudz View Post
    pics?

    Also follow the advice from the post aboce yours, Flush and verify pH is correct. What have you been feeding and how much for the last 3 weeks?
    Quote Originally Posted by Busta22 View Post
    I have the exact same problems hope some people can come up with some soultions, the flushing help, better signs in the foliage 3 days after flush
    Quote Originally Posted by Stormycirca65 View Post
    Racefan is 100% spot on. "Rust" is a fungi that presents itself as a nute lock out or nute burn problem, but it's actually a ventilation problem. The air in your grow space is not being replaced well and efficiently enough. This is usually a situation that involves inadequate exhaust, over abundant intake, and high humidity. Stagnant air and high humidity. Insects love this, plants do not.
    Unless the humidity is high/very high I doubt its rust. If it is rust mold you can rub your hand on it and you will have rust on your fingers. If those things happen then it is rust mold.

    Otherwise it is a nute/PH/transplant issue. I almost always get some of this when I transplant using FFOF soil. FFOF can be HOT and I always flush a couple times after transplant to limit this discoloration. Also runoff PH is usually low initially after transplant for me. Hot soil... A few roots get burned and these spots pop up.

    Verify PH, flush and 1/2 strength nutes.

    If its rust mold follow the advice of others. I have never had it with RH of 40% to 60% with good circulation in my grow.

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