Black Spots & Yellow New Growth on Catt
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  #1  
Old 09-09-2019, 11:07 AM
realoldbeachbum realoldbeachbum is offline
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Black Spots &amp; Yellow New Growth on Catt Female
Default Black Spots & Yellow New Growth on Catt

About a year ago I got my first orchid and immediately became wildly smitten. I now have 24 in my window sill(s) collection! All have been healthy – even the tiny ones purchased at the hardware store have thrived and produced new roots and growth. The problem: This beautiful BLC Greenwich ‘Elmurst’ has developed small black spots on one of the leaves (first pic), and most disturbing, the newest small leaf is yellow (second pic). Also, two old psuedobulbs are shriveled. What is wrong with him? When I saw the spots, I immediately drenched with Physan 20. (He had very robust growth until the latest small yellow one.) I am ready to panic. All advice is appreciated!
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  #2  
Old Yesterday, 01:54 AM
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camille1585 camille1585 is online now
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I'm bumping this thread so that hopefully someone can help you.

I don't grow many Catts (and only recently started!) so can't help you much. The black spots aren't too worrying I think, Catts tend to be a bit prone to spotting.
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  #3  
Old Yesterday, 10:52 AM
realoldbeachbum realoldbeachbum is offline
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Black Spots &amp; Yellow New Growth on Catt Female
Default Thanks Camille1585. Spots on Catts - Newbie Needs Help

Quote:
Originally Posted by camille1585 View Post

I'm bumping this thread so that hopefully someone can help you.

I don't grow many Catts (and only recently started!) so can't help you much. The black spots aren't too worrying I think, Catts tend to be a bit prone to spotting.
Thanks for responding, Camille 1585. As I posted, I am totally new to Orchids (one year) and as bad as I hate to admit it, I am almost obsessed. I have read everything I can find on Catt diseases and looked at probably a hundred pics of Catt fungus / bacteria / sun spots, etc, but cannot be sure what this one has. I have not lost an orchid yet and I don't want to. Have a blessed day.
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Old Yesterday, 11:15 AM
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The spotting on the leaf tip doesn't really bother me that much. The wrinkling of the pseudobulbs does, as it suggests the plant isn't getting enough water. That happens most often from either underwatering or a bad root system.

One of the basic orchid-growing tenets that most beginners don't quite grasp is that orchids do much of their respiratory gas exchange through their roots, rather than through leaves, as is the case for terrestrial plants. That means that we must find a balance between providing sufficient water and sufficient air to the roots.

Using a coarse, open potting medium helps the air, but requires a great deal more watering to keep the plant happy. A dense medium provides plenty of water, but risks suffocating the roots when it's saturated.

From the photos, I was unsure if that yellowing growth is a smaller, old growth that is fading away, which can be perfectly normal, or if it is, as you stated, a new growth, in which case it's decidedly not, making me suggest you unpot the plant and inspect that root system.
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