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02-06-2015, 03:13 PM
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Member
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Join Date: Jun 2012
Zone: 7b
Location: South Carolina
Posts: 38
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Is this black rot?
I've got a neostylis Lou Sneary 'Bluebird' that suddenly (and I mean within days) has black spots all up and down the main plant. It's now starting to spread to the leaves. I can only think it's infected with black rot. I've attached a photo. Thoughts?
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02-06-2015, 04:42 PM
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Senior Member
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Join Date: Aug 2013
Zone: 11
Location: Far North Queensland
Posts: 790
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Not sure, how long you had the plant for? Any environmental changes? Isolate it for now. I use a phosphoric based treatment for rot, usually as a prevention though.
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02-06-2015, 04:58 PM
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Senior Member
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Join Date: Aug 2011
Zone: 7b
Location: Manhattan, NY
Age: 39
Posts: 8,411
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It is fungal infestation not rot. It was at one point exposed to cold. Spray it with antifungal home remedy or you can buy the big guns in the garden store....
high humidity, warmth, good air circulation and bright light....feed it weekly
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02-06-2015, 05:54 PM
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Senior Member
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Join Date: Sep 2010
Zone: 5b
Location: Ohio
Posts: 10,877
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Mine gets purple coloring in that area, along with the same sort of spots, during the summer due to exposure to high light. I cannot tell if what you have is something different.
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02-06-2015, 06:03 PM
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Senior Member
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Join Date: Nov 2014
Location: sheffield,uk
Posts: 313
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hmm if it was black rot I would expect your leaves to look a lot more yellow and dying.
probably best to spray it with some fungicide, but im not clued into vanda type orchids so I could be wrong.
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02-06-2015, 06:22 PM
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Senior Member
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Join Date: Jun 2012
Location: N.T
Age: 24
Posts: 432
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Yeah im agreeing with leaf mite here, because mine does that during the sunnier months
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02-06-2015, 06:35 PM
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Senior Member
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Join Date: Sep 2012
Zone: 7b
Location: VA
Posts: 695
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Yep mine does the same thing when exposed to higher light.
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02-06-2015, 07:34 PM
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Senior Member
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Join Date: May 2008
Zone: 9a
Location: Nor Cal
Posts: 26,634
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My thought also was just pigment from higher light, which is nothing to worry about - but, I can't say for sure from the pic. Are the spots actually black, or more a dark purple?
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02-07-2015, 07:30 AM
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Member
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Join Date: Jun 2012
Zone: 7b
Location: South Carolina
Posts: 38
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Thank you, everyone, for taking the time to respond. I have another orchid that has pigment from high light, too, and was wondering if that's what it was. I'll spray it just in case.
---------- Post added at 07:30 AM ---------- Previous post was at 07:28 AM ----------
I think the spots are black, but it's hard to tell. I'll spray and let you know what happens.
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02-09-2015, 02:03 PM
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Senior Member
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Join Date: Nov 2011
Posts: 7,196
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No, it is natural pigmentation on plants of this type.
Nothing to worry about.
If you give less light, then the color will lighten on the future growth but it'll always be present in some degree unless you grow it in too low of light, in which case you won't see flowers. lol
Happy growing!
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