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Nematodes...

Discussion in 'Issues, Disease and Pests' started by Wolf, Apr 18, 2017.

  1. Wolf

    Wolf Member

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    I was reading an article and panic lol
    Has someone find those?
    Foliar Nematodes seem to be a thing that is present everywhere, it is scary!
    I mean for people that buys at home improvement stores, nothing guarantees that the orchid was never in touch with a tomato, strawberry or an african violet! (That I read are common host)
    Has anyone used any chemical against those or not chemicals but something natural? (Just playing safe)
     
  2. Chuck-NH

    Chuck-NH Well-Known Member

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    Foliage nematodes are difficult to control in other crops. For temperate perennials such as Hosta, individual plants are dug up and soaked in near boiling water or they are typically destroyed.

    I was not aware that foliage nematodes were an issue with Orchids. In the US, Pylon (very expensive) is registered for use with foliage nematodes only in a greenhouse setting...and I'm not sure if it would work on Orchids or not.
     
  3. Marni

    Marni Well-Known Member Staff Member Supporting Member

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    I've never heard of them, so I'm not going to worry until I see them.
     
  4. Chuck-NH

    Chuck-NH Well-Known Member

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    Here is a publication from Hawaii in 1998...potentially more of a problem than we think since it can be confused with other maladies. Although if it was real prevalent, we might have heard more about it by now. In my Wife's company, they do test their crops (temperate perennials) for foliage nematodes using microscopy. If I see any orchids in our collection that are suspect, I'll try and get some tissues samples tested.

    https://www.ctahr.hawaii.edu/oc/freepubs/pdf/PD-13.pdf
     
  5. Marni

    Marni Well-Known Member Staff Member Supporting Member

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    Thanks, Chuck. My ag inspector is coming this morning and I will ask him what he knows about these in our area.
     
  6. Ray

    Ray Orchid Iconoclast Supporting Member

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    Wow! That paper is scary!

    Over the past 40+ years, I'll bet that quite a few of the "rots" or other undiagnosed maladies I've observed might have been nematodes.
     
  7. Chuck-NH

    Chuck-NH Well-Known Member

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    That's what I was thinking...so when I do run into a case like that, going to see if I see wiggly worms through the microscope.
     
  8. Marni

    Marni Well-Known Member Staff Member Supporting Member

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    I was scheduled for an agriculture inspection today. The first thing I asked the inspector was "foliar nematodes?" Sonoma county is an agricultural county and he is a senior inspector with about 20 years on the job. He had never heard of them and will check to see what he can find out.

    The paper was scary. A bit like reading the side effects of a drug.
     
  9. KellyW

    KellyW Orchid wonk Staff Member Supporting Member

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    I was going to read the paper but now I'm thinking ignorance is bliss :rolleyes:.
     
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  10. naoki

    naoki Well-Known Member

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    Interesting, thanks for the link Chuck. In retrospect, some of the orchids showed some of the symptoms described there. To detect it, it appears that you can suspend the chopped up leaves and observe under microscope. I should try it when I see a suspect.

    I didn't know that there aren't so many chemical control options against nematodes. But this paper is interesting:
    Jagdale, G. B., and Grewal, P. S. 2002. Identification of alternatives for the management of foliar nematodes in floriculture. Pest Man- agement Science 58:451–458.PDF link
    It shows that ZeroTol is effective against Aphelenchoides spp., which is the cause of orchid infection.

    There are several other papers using plant extract as nematicides. One of them showed Cannibis sativa leaves have some effects on other types of nematodes: https://www.researchgate.net/profil..._incognita/links/09e4150facb273f41c000000.pdf
     
  11. Fumiaki Takahashi

    Fumiaki Takahashi miniature orchidaholic

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    I did the same thing.
     
  12. Fumiaki Takahashi

    Fumiaki Takahashi miniature orchidaholic

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    Yuck!!!
     
  13. Chuck-NH

    Chuck-NH Well-Known Member

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    I think my wife has a video of nematodes through a microscope...(from infected Hostas). We were at a conference last Summer where Dr. Grewel updated the 2002 paper...not sure the zerotol was as effective as originally thought. I can't find it on the web, but will see if I can get a copy.
     
  14. naoki

    naoki Well-Known Member

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    Thanks, Chuck. I think this is probably it:

    An, R., Karthik, N.K. and Grewal, P., 2017. Evaluation of botanical and chemical products for the control of foliar nematodes Aphelenchoides fragariae. Crop Protection, 92, pp.107-113. (ResearchGate abstract)

    I'll take a look at it, too when I have time.
     
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  15. Chuck-NH

    Chuck-NH Well-Known Member

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    Yes Naoki, that was the research I was thinking about. Given that Orchids are so varied compared to Hostas, I wonder if the results would be anything close to the same. Hopefully, I won't have to find out . The Nema-Kill would definitely be worth an experiment since its basically non toxic to humans.
     
  16. Selmo

    Selmo Active Member

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    Rarely do nematodes numbers become large enough to cause much of a problem. It is what they bring with them, fungus, bacteria, disease, and insects, that cause the problems. Healthy plants and good media quality should be balanced with good and bad types of nematodes, it's when we get this balance out of whack, with insecticides, fumigants, and soil sterilizers, that we start to have problems with them. Nematodes are everywhere, in everything. There are benefical ones that cause harm and parasitic ones that are benefical. Good sanitation, not using old media and use of correct pesticides, and you should not have problems with nematodes. My two cents.
     
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