Using Physan as a drench?

Discussion in 'Problems, Pests, & Diseases' started by silence882, Sep 11, 2016.

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  1. Sep 11, 2016 #1

    silence882

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    Has anyone ever used Physan as a drench? If so, at what concentration?

    The directions indicate it's fine at 1.5 tsp/gal for ornamental plants, but I just wanted to check to be sure. I've got 2 pots with what looks like mold growing in them that I'd like to kill with fire.

    --Stephen
     
  2. Sep 11, 2016 #2

    Ray

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    I have done so, but at 1 teaspoon per gallon. Don't forget that some plants really don't like Physan, which is why I switched to Biosafe Disease Control, which has shown no phytotoxicity whatsoever.

    However, the presence of mold indicated decomposition. Treating it is just treating the symptom, not the problem. I'd consider repotting, then treating.
     
  3. Sep 11, 2016 #3

    silence882

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    Thanks, Ray. I just got the plants (2 Phrag. Barbara LeAnn) and noticed the mold pop up, so I repotted. Now the mold looks like it's growing in the fresh mix so it's time for chemicals.
     
  4. Sep 12, 2016 #4

    abax

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    I don't use Physan, but Cleary's 3336 is a much safer
    choice for orchids.
     
  5. Sep 12, 2016 #5

    Ray

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    Angela, they're for two different applications.

    Cleary's is a systemic fungicide. Physan is a topical disinfectant that kills bacteria, fungi, algae and viruses.
     
  6. Sep 12, 2016 #6

    Ozpaph

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    I, very occasionally, use it at the strength Ray suggests.
     
  7. Sep 12, 2016 #7

    gonewild

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    I used it once in an ebb/flow system. Added it to the tray water at recommended strength and it damaged small seedlings without any getting on the foliage. Never used it again.
     
  8. Sep 12, 2016 #8

    Ray

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    Hence my Biosafe recommendation...
     
  9. Sep 13, 2016 #9

    abax

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    Ray, isn't mold a type of fungi? I've used Cleary's on mold
    and it worked very well.

    Lance, are you referring to Physan or Cleary's?
     
  10. Sep 13, 2016 #10

    gonewild

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    Physan
     
  11. Sep 13, 2016 #11

    tomkalina

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    Our experience was similar to Lance's. Sprayed a 10% solution of Physan 20 on a tray of freshly deflasked Phrag. besseae fma flavum 'Fox Valley Gold' HCC/AOS (x self) seedlings years ago (these were the first flavum seedlings produced) and all died within 10 days. A very expensive lesson. We still use a 10% solution to sterilize cutting tools and to paint on plant wounds, but never as a drench.
     
  12. Sep 13, 2016 #12

    Ray

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    Sure, but that's a really expensive way of getting rid of mold!
     
  13. Sep 13, 2016 #13

    Redtwist

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    Used Physan 20 recently (at slightly weaker than recommended for 'monthly preventative' as per the instructions) to flush through a couple of phals I inherited with bad algae and snow mould. Killed off the problem beautifully in just a few days and no sign of damage to the plants health since.. Never drenched a whole plant though.
     
  14. Sep 14, 2016 #14

    abax

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    That's o.k. Ray. I've got a 30 lb. bag stored. I got a bit
    carried away when it was on sale somewhere or other. The
    granular stores quite well. Oh, I remember now...our local
    Southern States store orders "stuff" for me since we do a
    lot of business there.
     
  15. Sep 16, 2016 #15

    silence882

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    Well I just poured the Physan through the media at 1 tsp/gal. I'll report back in a few weeks after I see how it does.
     
  16. Sep 18, 2016 #16

    Happypaphy7

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    Physan. never again after using it once some 10 years ago.
     
  17. Sep 19, 2016 #17

    Erythrone

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    I agree. I don't use it anymore in potting media or on plant. I use similar products for cleaning the growing area, though.
     
  18. Sep 21, 2016 #18

    silence882

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    No change so far. I just hit it with a second dose.

    Here's some photos of the mold if anyone has any recommendations for dealing with it:
    [​IMG]
    [​IMG]
    [​IMG]

    --Stephen
     
  19. Sep 21, 2016 #19

    Ray

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    What are the ingredients in your mix?

    Are you sure the fungus is bad? I've seen similar growth in Orchiata, and was told it was a penicillium species that killed other fungi. You could always does it with Inocucor....
     
  20. Sep 21, 2016 #20

    silence882

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    One's in bark/perlite/charcoal, the other 2 are in CHC/perlite/charcoal.

    Unfortunately I have no way of knowing what it is. Therefore it has to die lest it spread.

    I'll give inocucor a shot if the second dose doesn't eradicate it.
     

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