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-   -   Catasetum bulb black spot (http://www.orchidboard.com/community/catasetum-and-stanhopea-alliance/102161-catasetum-bulb-black-spot.html)

silanah77 01-09-2020 12:46 AM

3 Attachment(s)
Thank you again to all of you nice people:) But as I said I've already cut the black area off. I can't tell if the spots became soft or not, because most of them were like black "lines"..I don't know if you can understand my writings.. I'm attaching photos of the plant now - as I said this was my first catasetum and obviously I didn't succeed to take a good care of it:( I don't know if an older bulb can produce new growth....? The older bulbs are very shriveled and I'm afraid to moisture them because of the last cutted bulb...
So is there any chance for my catasetum or not? :(

Roberta 01-09-2020 01:05 AM

The last photo (the one on the right) shows a little bit of intact pseudobulb, maybe has a chance. Not a good chance, but never say never. Those older ones, that are shriveled, might also produce a shoot. So put in a pot with some spaghnum moss, and then just let it be - no water, doesn't need much light. You did damage most of the newest pseudobulb. But it could surprise you, so give it a chance.

silanah77 01-09-2020 02:11 AM

Quote:

Originally Posted by Roberta (Post 908605)
The last photo (the one on the right) shows a little bit of intact pseudobulb, maybe has a chance. Not a good chance, but never say never. Those older ones, that are shriveled, might also produce a shoot. So put in a pot with some spaghnum moss, and then just let it be - no water, doesn't need much light. You did damage most of the newest pseudobulb. But it could surprise you, so give it a chance.

Thank you, Roberta!!! I'll put it in a spaghnum moss, but should I put in on a light place? Now it is on dark place in a box...

Roberta 01-09-2020 11:04 AM

Quote:

Originally Posted by silanah77 (Post 908606)
Thank you, Roberta!!! I'll put it in a spaghnum moss, but should I put in on a light place? Now it is on dark place in a box...

While it is dormant, it doesn't care whether it gets light or not. (with no leaves, it can't photosynthesize anyway) So just put it where it is out of the way... If it starts a growth, then it will want light.

silanah77 01-09-2020 11:44 AM

Quote:

Originally Posted by Roberta (Post 908623)
While it is dormant, it doesn't care whether it gets light or not. (with no leaves, it can't photosynthesize anyway) So just put it where it is out of the way... If it starts a growth, then it will want light.

Thank you again! I'll do it and I will hope for a miracle. Have a nice day!

isurus79 01-09-2020 12:47 PM

For future purposes, only cut large pieces off if the black spots are soft. There is a good change you cut the bulb for a sunburn or something that would not otherwise harm the plant.

silanah77 01-09-2020 01:01 PM

Quote:

Originally Posted by isurus79 (Post 908636)
For future purposes, only cut large pieces off if the black spots are soft. There is a good change you cut the bulb for a sunburn or something that would not otherwise harm the plant.

Thank you very much! Have a nice day!

SouthPark 01-09-2020 04:08 PM

Quote:

Originally Posted by silanah77 (Post 908604)
because most of them were like black "lines"

Did those regions eventually begin to sink down below the rest of the pseudobulb's surface?

In your original photos --- the affected regions were limited. But the new photos shows quite extensive removal of bulb tissue.

If you notice this sort of thing early, and if you see the affected portion (patch) sink below the regular surface of the bulb, then spraying a systematic fungicide on the bulb could be beneficial.

After I spotted something just like your case (greyish black/brown region) - except mine was more like a small patch --- treatment contained the patch, which then changed colour to something ---- maybe dark brown -- basically dried up or became healed. The blemishes remained, which is why I will be able to take photos of it to show you when I return home from holidays.


silanah77 01-10-2020 01:28 AM

Quote:

Originally Posted by SouthPark (Post 908643)
Did those regions eventually begin to sink down below the rest of the pseudobulb's surface?

In your original photos --- the affected regions were limited. But the new photos shows quite extensive removal of bulb tissue.

If you notice this sort of thing early, and if you see the affected portion (patch) sink below the regular surface of the bulb, then spraying a systematic fungicide on the bulb could be beneficial.

After I spotted something just like your case (greyish black/brown region) - except mine was more like a small patch --- treatment contained the patch, which then changed colour to something ---- maybe dark brown -- basically dried up or became healed. The blemishes remained, which is why I will be able to take photos of it to show you when I return home from holidays.


Thank you for your detailed comments! Yes, the patches were deep in the bulb, that's why the cuts are deep. I'll be happy if you post photos of your orchid when it's possible.
For future I'll know to apply fungicide, although I'm not very familiar with them, but I'll search for more info.
Now I'm just crossing my fingers my orchid to survive...
Thank you again and have a nice day!

SouthPark 01-12-2020 07:46 PM

1 Attachment(s)
Quote:

Originally Posted by silanah77 (Post 908668)
Thank you for your detailed comments! Yes, the patches were deep in the bulb, that's why the cuts are deep. I'll be happy if you post photos of your orchid when it's possible.
For future I'll know to apply fungicide, although I'm not very familiar with them, but I'll search for more info.
Now I'm just crossing my fingers my orchid to survive...
Thank you again and have a nice day!

Silanah -- I took this photo this morning .... attached. The rot region totally dried. No issues with the bulb. The original grey brown region has become a dark brown dried patch. None of my other catasetum orchids had this.

The cause wasn't sunburn. And the original ominous colouring was exactly like that in your photo. My application of yates anti-rot phosacid stopped the attack of whatever it was.



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