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Chemicals for fungal or bacterial problem

Discussion in 'Issues, Disease and Pests' started by Tom-DE, Jan 9, 2012.

  1. Tom-DE

    Tom-DE Well-Known Member Supporting Member

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    I am looking for recomendation. They must be safe for Dendrobium species in Formosae section and Oxyglossum section. Thanks.
     
  2. Chris

    Chris New Member

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    Tom, can I ask for more details about the situation?
     
  3. Tom-DE

    Tom-DE Well-Known Member Supporting Member

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    In one of my growing areas, I had/have some fungal black spots on the leaves of some of my Bulbos/Trias. and almost all of my formosae Dendrobium species. Most of the plants in this growing area are warmer growers and they did spend their summer outside in the yard... It all started in late fall when it was cool and damp. The affected leaves will turn yellow and drop off in just few days. Most of my Dendrobium from the formossae section are almost leafless now...

    Some chemicals are very harmful/lethal for the Dendrobiums in formossae and Oxyglossum sections, so recomendations based on the first-hand experiences will be greatly appreciated.
     
  4. Dale

    Dale New Member

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    Daconil (chlorothalonil).
     
  5. Tom-DE

    Tom-DE Well-Known Member Supporting Member

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    Thank you very much, Dale. It looks like a product ready available in local stores too.
     
  6. Uluwehi

    Uluwehi angraecoids, dendrobiums and more Supporting Member

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    I concur. I have never had phytotoxic reaction on any orchid with Chlorothalonil WP. However the residue is not the prettiest thing and it takes a few months to wear-off.
     
  7. Ray

    Ray Orchid Iconoclast Supporting Member

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    Such applications are great for treating the plant, but considering the spread of spores, it is very easy for the issue to recur from those laying dormant (or not so) in the growing environment.

    I noticed a complete drop in fungal infections after spraying my entire greenhouse - glazing. floors, benches, and plants - with Zero-Tol. I originally got the stuff for use as an algaecide (works like a charm), but the rest was a pleasant side effect. No harm to any plants or blossoms.
     
  8. Dale

    Dale New Member

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    Sounds like I need to get some Zero-Tol. Just finished pressure washing the interior glazing in the GH. PITA. Thanks, Ray.
     
  9. Ray

    Ray Orchid Iconoclast Supporting Member

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    Dale, that's part of my routine too, and MAN is that a PITA.

    They sell a "Ready to Spray" quart bottle (I carry them too...) that has it's own proportioner and valve, so you just put it on the hose end and away you go. Any algae you missed will be a white film in about 10 minutes.
     
  10. Tom-DE

    Tom-DE Well-Known Member Supporting Member

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    Thanks

    Do you grow any Dendrobiums in the formosae and oxyglossum/cuthbersonia sections? I am assuming you are not spraying Zero-Tol. on the plants? I have to be careful with chemicals for those.
     
  11. Chris

    Chris New Member

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    Great thread, thanks guys.
     
  12. Ray

    Ray Orchid Iconoclast Supporting Member

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    No Tom, I do not. Dendrobiums are SUCH unappealing plants.
     
  13. Kitty

    Kitty AKA\Debby

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    any effects on live spanish moss? I recently sprayed my walls with phisayn, I was told it would get rid of the algae in seconds, I didn't have enough to spray at the recommended dose, it did a not so good job on the algae yet killed about 50% of the moss that was hanging in front of the wall. I don't have a lot of algae, as my greenhouse is just 1 year old, but I feel this is something to not let get started. :bang:
     
  14. Tom-DE

    Tom-DE Well-Known Member Supporting Member

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    LOL! That last statement is not necessary, Ray. I don't expect you would have the same taste...perhaps you should start your own thread and sell your junks!
     
  15. Ray

    Ray Orchid Iconoclast Supporting Member

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    I have no first-hand experience with Zero-Tol and Spanish Moss, but if you consider that some orchids are susceptible to Physan, I would be wary about using it without testing.

    The literature at Bio-Safe Systems' website states zero phytotoxicity...
     
  16. Ray

    Ray Orchid Iconoclast Supporting Member

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    Just thought I'd throw that in, Tom. There are a lot of appealing den species out there, but the ones I like seem to prefer conditions I'm not willing to provide.
     
  17. Kitty

    Kitty AKA\Debby

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    good information Ray thank-you
     
  18. Dale

    Dale New Member

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    Ordered 2 1/2 gallons this morning. Should be here tomorrow. I'm keen to try it out.
     
  19. Tom-DE

    Tom-DE Well-Known Member Supporting Member

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    You should receive a discount if you ordered it from Ray and he should make a donation to OI, right? I though I'd throw this in ...
     
  20. Ray

    Ray Orchid Iconoclast Supporting Member

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    Nice try, Tom.