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 Post subject: WHAT IS THIS?
PostPosted: Sun Oct 28, 2012 3:32 pm 
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I noticed some strange markings on the top side of a paph leaf today. In fact it is on several of the plant's leaves.
Is this some sort of scale insect? I can't match this damage to pics in my books or on the internet!

I scoured the plant but could find no trace of insects.

The plant seems otherwise quite healthy - slow to flower but in active growth.
It is one of the Dutch grown complex hybrids with no name.

I would hate to loose this plant and had been hopeful of flowers this year.

Image

Image

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 Post subject: Re: WHAT IS THIS?
PostPosted: Sun Oct 28, 2012 6:14 pm 
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Rachel,
I don't think it is a disease. It just looks like a bit of mesophyll cell collapse, probably caused by
drying out. Nothing to worry about. The plant looks to be very healthy and growing well,
Regards,
David


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 Post subject: Re: WHAT IS THIS?
PostPosted: Sun Oct 28, 2012 11:33 pm 
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ah... i see.. i have this at few plants too. glad to hear its nithing to worry about
:)


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 Post subject: Re: WHAT IS THIS?
PostPosted: Sun Oct 28, 2012 11:39 pm 
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Wow, that never happens!
What, no irreversible creeping death?
Thank you, David.
That is great news.
I will take the plant out of isolation and put it back on its humidity tray tomorrow.

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 Post subject: Re: WHAT IS THIS?
PostPosted: Mon Oct 29, 2012 7:13 am 
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You may find this helpful :)

http://www.aos.org/Default.aspx?id=130


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 Post subject: Re: WHAT IS THIS?
PostPosted: Mon Oct 29, 2012 10:35 am 
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Thanks, Caz. That is very interesting.
I reckon it was the water temperature that did it. The last few times I watered, I used warm water but I haven't always done so.

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 Post subject: Re: WHAT IS THIS?
PostPosted: Mon Oct 29, 2012 10:58 am 
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By god aren't orchids fussy beggars! You'd want to love them!

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 Post subject: Re: WHAT IS THIS?
PostPosted: Mon Oct 29, 2012 11:44 am 
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I was wondering whether this is the same thing. These ara Catasetum leaves showing odd raised structures, but no mites or other insects


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 Post subject: Re: WHAT IS THIS?
PostPosted: Sat Jun 20, 2015 12:16 am 
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Leaf edema?

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 Post subject: Re: WHAT IS THIS?
PostPosted: Sat Jun 20, 2015 9:26 am 
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LarsKurth wrote:
I was wondering whether this is the same thing. These ara Catasetum leaves showing odd raised structures, but no mites or other insects


That is not what I had.

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 Post subject: Re: WHAT IS THIS?
PostPosted: Thu Jun 25, 2015 4:09 am 
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LarsKurth wrote:
I was wondering whether this is the same thing. These ara Catasetum leaves showing odd raised structures, but no mites or other insects

Very important for all Catasetinae growers!

It IS mites, living inside the leaf.

They attack catasetinae under growth stress, not watered/feeded enough and colonise the leaf looking like little œdemas they are not. Real œdema would eventually dry up. These don't.

So:
- cause: underwatering/underfeeding
- prevention: water/feed enough, meaning for most Catasetinae leave a cup with water and feeding+ osmocote on top of sphagnum. They will thrive on this during growth. Then stop.
- for mites: systemic miticide. the leaf won't return to normal.

Please, I give conferences on pests and diseases, can I use the pic? (credited, of course) thanks in advance.

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