Paph Lynleigh Koopowitz - Black patches on leaves
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  #1  
Old 11-20-2020, 03:16 PM
Clawhammer Clawhammer is online now
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Paph Lynleigh Koopowitz - Black patches on leaves
Default Paph Lynleigh Koopowitz - Black patches on leaves

Hello friends. I received this Paph Lynleigh Koopowitz yesterday from a seller on Etsy.

What do you think is going on with leaves? Treatable? Treatments advice?

Thanks!

[IMG]unnamed (22) by Eric, on Flickr[/IMG]

---------- Post added at 11:14 AM ---------- Previous post was at 11:09 AM ----------

The black "stuff" doesn't wash off and is not effecting the bottom leaves. It appears to mostly the darker green areas, leaving me to initially wonder if this could be natural coloration. However, it appears to be totally overtaking the second most recently grown leaf. I own both parents and neither have this black "stuff".

---------- Post added at 11:16 AM ---------- Previous post was at 11:14 AM ----------

Or maybe burns on the higher chlorophyll areas?
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Old 11-20-2020, 04:17 PM
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CH - it really does appear to be mainly in the dark green coloured patches - regular darker green areas.

I can't say for sure, but I'm inclined to go toward burn.

The left-hand side of that leaf has some appearance of carbon residue ------ like after we finished a barbeque on a bbq plate.

Were the leaves exactly lke this when it arrived?

So far - doesn't appear to be disease or under attack though.
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Old 11-20-2020, 04:20 PM
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Originally Posted by SouthPark View Post
CH - it really does appear to be mainly in the dark green coloured patches - regular darker green areas.

I can't say for sure, but I'm inclined to go toward burn.

The left-hand side of that leaf has some appearance of carbon residue ------ like after we finished a barbeque on a bbq plate.

Were the leaves exactly lke this when it arrived?

---------- Post added at 06:17 AM ---------- Previous post was at 06:16 AM ----------

pp
Thanks for responding South Park. Yes, this is exactly how the leaves looked when it arrived (16 hours ago).
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Old 11-20-2020, 05:29 PM
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To me most of it does look like it's pigment. As far as owning both parents, my question would be is one of the parents of this cross a "dunkel" P. delenatii and is that what you also grow? I ask because the dunkel form of P. delenatii definitely has varying degrees of very dark almost black pigment on the upper side of the leaves in pretty much this same pattern.

The only thing that gives me slight pause is the way some of the pigment looks a little diffused on that one leaf with the most dark markings on it.
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Old 11-20-2020, 06:04 PM
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To me most of it does look like it's pigment. As far as owning both parents, my question would be is one of the parents of this cross a "dunkel" P. delenatii and is that what you also grow? I ask because the dunkel form of P. delenatii definitely has varying degrees of very dark almost black pigment on the upper side of the leaves in pretty much this same pattern.

The only thing that gives me slight pause is the way some of the pigment looks a little diffused on that one leaf with the most dark markings on it.
Delenati var dunkel was not called out as the parent but the darkening on the foliage of that variety sure looks a lot like this, thank you.

I wonder if the dark pigment is a reaction to high light conditions as the lower leaves do not have any of those markings...
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Old 11-20-2020, 07:13 PM
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It looks like a burn to me as well. But if the margins keep expanding, I would cut off the leaf.
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Old 11-20-2020, 07:19 PM
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Originally Posted by Clawhammer View Post
Delenati var dunkel was not called out as the parent but the darkening on the foliage of that variety sure looks a lot like this, thank you.

I wonder if the dark pigment is a reaction to high light conditions as the lower leaves do not have any of those markings...
Generally with P. delenatii dunkel, the lower leaves have much less or even no pigmentation on top aside from the margins. It's typically the newest top leaves that develop additional pigmentation beyond the leaf margins/edges and it fades over time. It can be related to higher light levels, but it seems/seemed to me that it was more of a variable individual trait. Some plants will simply have more pigmentation than others.
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Old 11-21-2020, 08:31 AM
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Quote:
Originally Posted by estación seca View Post
...if the margins keep expanding, I would cut off the leaf.
And/or try a copper treatment.
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Old 11-21-2020, 10:50 AM
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Most welcome CH. If the black substance appears to be building up ----- such as forming layers and if it appears to be taking out/destroying portions of the leaf, then Ray's suggestion of a copper treatment could put a stop to whatever it is. And if the spread just so-happens to continue ......... then cutting could be then be necessary to do (- mentioned by E.S.).

And also could ask the seller if they were aware of those particular features. All behind you on this one! Nice orchid!
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