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  #1  
Old 07-01-2011, 03:39 PM
cday2inflorida cday2inflorida is offline
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Join Date: Sep 2006
Zone: 9b
Location: Riverviw, Florida
Posts: 858
Black Rot Female
Default Black Rot

It had to happen. We have had nonstop rain for several days. I noticed the first catt. It had come up over night and was contained to a leaf. I excised down to the pb. poured peroxide on the cut and isolated it. Just found the 2nd catt, again contained to a leaf.
Before I start spraying with D. M45 the rest of my collection does anyone think a systemic fungicide might be a better choice??
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  #2  
Old 07-01-2011, 05:05 PM
tucker85 tucker85 is offline
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Join Date: Sep 2009
Zone: 10b
Location: Plantation, Florida
Age: 77
Posts: 5,994
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I lose one or two leaves every rainy season. I agree it can show up overnight. Luckily it has never progressed past one leaf on my plants. I use a combination of Dithane and Thiomil recommended to me by Broward Orchid Supply. Martin Motes recommends Alliette or Subdue 2E for black rot. I try to spray once a month during the rainy season. I also spray the wooden slats and poles that above the orchids. Last year I noticed that some fungus grew up there and the rain would just washrd it into the orchids. Good luck.
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  #3  
Old 07-01-2011, 05:56 PM
Daethen Daethen is offline
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Join Date: Sep 2010
Zone: 4a
Location: Wisconsin, USA
Posts: 2,215
Black Rot Female
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I lost a few to black rot until I realized what I was dealing with. I don't have a clue yet what to do to stop it other than excise and repot.
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