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Thread: Yellowing Leaves

  1. #9
    Never Knows Best gill_za's Avatar
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    I am sorry to bother you fellow forum members once again but I need your help. The above mentioned plants are not doing so great. Below are the pictures that show that even the young leaves are being affected with this. As I have mentioned in another thread (there are links to it) I have found nematodes that are washed out from the pot when I top-water it. I can only suspect they are the ones that are responsible for damaging the plants.


    20110509_004.jpg by gillza, on Flickr


    20110509_003.jpg by gillza, on Flickr

    Besides the yellowing both plants are producing trapless leaves as well:


    20110509_002.jpg by gillza, on Flickr

    So far I have tried imidocloprid as was suggested by Not a Number (no dice). I have tried AzaMax that is supposed to be nematode suppressant (whatever that means). Nematodes are still there. I'm considering buying predatory nematodes or nematophagous fungus to control the pests as a last resort.

    Is there something else I could do?


    P.S. Seen this during the weekend

    20110507_011.jpg by gillza, on Flickr

  2. #10
    jonnyq's Avatar
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    Is repotting into a fresh batch of media a possible solution?

    (i.e. I don't know if the stress of repotting would make things worse...?)

  3. #11
    Never Knows Best gill_za's Avatar
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    Quote Originally Posted by jonnyq View Post
    Is repotting into a fresh batch of media a possible solution?

    (i.e. I don't know if the stress of repotting would make things worse...?)
    I'm just scared that even If I wash the plant to remove the old soil and whatever is causing the problem, if it is nematodes some of them may remain on/in the roots and will reinfestate the new soil in time.

  4. #12
    Not Growing Up! GrowinOld's Avatar
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    Afraid of what?

    As I mentioned in your other post....

    I would suggest removing the plant from the pot & washing off all the soil. (Run it under temperate tap water.) Then soak the plant in fresh water to help gently remove any "soil", moss or "bugs"! (Be sure to dump the water, as it may contain the bugs you are trying to eradicate.)

    Then, if you are getting any results killing them with the neem or some other bug killer that isn't too noxious, (I myself usually use something with pyrethrins in it, as I have found it works well & is less harmful to humans*) and douse the plant & its roots/bulb-let with it. Let it sit in a dish of it for a bit to allow it to soak into the nooks & crannies. Then after some time (use your better judgment, but I would assume anywhere from a few minutes up to an hour - but I would likely do about 5 or 10 minutes myself), I would then wash the plant under fresh water again. If you are worried about the "bug killer" harming the plant still, let it soak in clean, fresh water for a while, to dilute & wash off any remaining chemical.

    Then get a NEW pot & NEW potting media & re-plant the plant into its new & CLEAN home!

    Be absolutely sure to dispose of ALL the old pots & media, and thoroughly clean & wash all surfaces and tools (including your hands!) that came in contact with ANY contaminated pots/media/or plants! You do NOT want to cross contaminate your new pots & mix, and it only takes one small speck of contaminated media to infect your entire new pot.

    If you are still worried that there are still bugs hidden in your plant somewhere, then do the "washing/bug-killer/rinsing" procedure a couple times, although I don't think it would in any way be necessary if you do the process right the first time.

    There are too many places in your existing pot to provide refuge for the "bugs", as well as their eggs (if they produce any). With this method you will be getting rid of most of the areas that the bugs could inhabit right off the bat, and only treating the plant itself with "bug killer"/chemicals. Less chemical residues, less places for the "bugs" to hide in, and less of a chance that any will be around or survive the process.
    Furthermore, washing the plant off when your done will prevent any worry about residual "killer" causing any harm to the plant itself.
    This process is like moving into a brand new home, compared to hiring an exterminator to try to take care of your homes problem with ants/termites/roaches/bedbugs/bees/mice & rats! Personally, you want to keep the plant, but who cares about some old plastic pot and bug infested media!

    I have done this sort of process ever since I began growing plants, and it is a very common procedure. (I was taught about these basic plant care methods from a professional nurseryman, way back when I was a kid.)
    The entire process will stress your plant a lot less than you may think, unless you have never potted up a plant before. And even then, if you haven't... then it is time to learn! Re-potting is a very basic and necessary process to caring for plants, & should not stress most plants at all.
    So there is absolutely no need to worry what-so-ever. Currently, the way you are going about this is to treat an entire pot of media & eradicate all the "bugs" that it contains. I am suggesting simply getting rid of the pot and all the media (along with ALL the bugs that they contain), & only worrying about eradicating the bugs (if any) on the plant itself. It is actually safer & more likely of success, as there are a lot less pests residing on the plant than there are in that entire pot full of media!
    Besides, at some point down the line, you are going to have to re-pot the plant anyway... so why not now? The plant certainly looks healthy enough still to survive a simple re-potting!

    Well, good luck!

    Like your other post, I've offered advice/opinions based on what has worked for me. Your results may vary, depending on your situation, expertise & the environment your plants are in. I cannot say with certainty that the "bugs" are what is causing the plants to do what they are doing, but indeed it seems a good place to start.

    With the way your plant is yellowing and such, there could be other causes. (Like as was mentioned about lighting & such.) So keep in mind that getting rid of the bugs may not solve the problem. If it doesn't, then it is time to look into the other conditions you have the plant under.

    Again, good luck!

    *Back when I was young & working in a nursery, we used to sell chlordane dust, nicotine concentrate & other "nasty" stuff that worked great but was highly poisonous! Ah, the good ol' days!
    Experience is the best teacher. At least it used to be.
    But then, common sense isn't so common anymore, is it.


    http://www.terraforums.com/forums/sh...d.php?t=113866

  5. #13
    Never Knows Best gill_za's Avatar
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    Thank you very much for such a comprehensive reply, I will replant it hopefully in few days.

  6. #14
    Hello, I must be going... Not a Number's Avatar
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    If these are plant parasitic nematodes and the plants have been infested there isn't a nematicide yet developed that will kill the nematodes without killing the host plant. It is doubtful an insecticide will have much effect if it hasn't already. Some trade names of nematicides are Dowfume (gas), Telone, Vapid, Basamid, Nemafos, Temik and Mocap. Good luck trying to buy these in small quantities.

    Why don't you contact the nearest state or federal Department of Agriculture office and see if you can have the nematodes identified. Of course nowadays in this age of austerity socialist free testing and identification may no longer be available but the fees can still be reasonable.

    For all you know these may be beneficial nematodes.

    If they are indeed plant parasitic nematodes and your plants are infested (worms in tissue) there is usually little alternative other than destroying the plants and dumping everything and starting over again. Nematicides are preventatives at best.

    If the plants are continuing to decline then you have little to lose by cleaning and repotting the plants. Provided you take care to lessen the chances of reinfesting your new media and quarantine and isolate your current plants from any new acquisitions.

    Then again this is going on the assumption that the nematodes (or whatever) are the cause of your problems. Yellowing leaves could be a sign that the roots dried out (almost always fatal).
    Grand Hotel... always the same. People come, people go. Nothing ever happens.

  7. #15
    Never Knows Best gill_za's Avatar
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    Quote Originally Posted by Not a Number View Post
    If these are plant parasitic nematodes and the plants have been infested there isn't a nematicide yet developed that will kill the nematodes without killing the host plant. It is doubtful an insecticide will have much effect if it hasn't already. Some trade names of nematicides are Dowfume (gas), Telone, Vapid, Basamid, Nemafos, Temik and Mocap. Good luck trying to buy these in small quantities.
    I wonder if anyone here had success with predatory nematodes or nematophagous fungi..

  8. #16

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    I just had to re-pot my big VFT because he was potted using Schultz brand peat moss, and there were little osmocote bb's in it that they didn't feel the need to mention on the bag. Each leaf he put out was smaller and more squiggly and the traps were stunted.

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