[orchidhelp] Re: "Thai disease" aka Guignardia and Phyllosticta

  • From: "Diana Kulaga" <diandfrank@xxxxxxxxxxxxx>
  • To: <orchidhelp@xxxxxxxxxxxxx>
  • Date: Fri, 26 Feb 2010 17:53:04 -0500

OMG, you've got a case! Re: the nail polish, I know a grower who used clear 
polish to seal cuts on her plants. One thing you might want to be careful of (I 
don't know how much this would hurt, if at all) is that most polishes contain 
formaldehyde. OPI makes a formaldehyde free clear polish, and I think Clinique 
does as well.

  ----- Original Message ----- 
  From: nancy 
  To: orchidhelp@xxxxxxxxxxxxx 
  Sent: Friday, February 26, 2010 5:06 PM
  Subject: [orchidhelp] Re: "Thai disease" aka Guignardia and Phyllosticta

        Not sure if I can attach a couple of photos, but I'll try. Info from 
the St. Augustine Orchid Society's site (which has a truly excellent article on 
pests and diseases, with gruesome photos) says, "The first signs of Guignardia 
infection are tiny, dark purple, elongate lesions on either leaf surface. These 
lesions run parallel to the veins and elongate into purple streaks or 
diamond-shaped areas. spots often merge to form large irregular lesions that 
may affect a large part of the leaf. With age, the center of the lesion turns 
tan. Raised, black sporing bodies develop in the affected area. Affects mostly 
Ascocentrumand Vandasand their hybrids and may indicate insufficient light. 
This blight is also known as Phyllosticta; the names apply to two different 
sexual stages of the same fungus."
        The mature fruiting bodies give the leaf a texture very much like an 
emery board.
        I have been using Cleary's, among other potions. Was wondering if the 
nail polish would actually help to save the leaf - it does seem to be 
decreasing or absent in the newest foliage.
        Hurricanes bring this stuff, I swear. A couple of our society experts 
diagnosed it as mites, which I treated for for years. Wasn't.
        Regards - Nancy

        "Humor is reason gone mad." 
        -------- Groucho Marx

        --- On Fri, 2/26/10, Gareth Wills <gwills13@xxxxxxxxxxxxx> wrote:


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