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  #1  
Old 09-14-2018, 11:54 AM
Merita Merita is offline
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Default Doubts about black rot in cattleyas

Why when a cattleya is bought from a nursery, does it sometimes arrive with black spots on the leaves? How does the plant pick up the fungus, if it is from the ground and the plant is not wet inside the package?
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Old 09-14-2018, 02:05 PM
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Please post photos.
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Old 09-14-2018, 06:59 PM
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The first plant came with a purple brown leaf, more than half the leaf. I cut it and put cinnamon in the pseudobulb. The second leaf has these sunken spots and growing, I put daconil but I know this does not work here, it is best to cut it. These plants came with others, wrapped separately and these have no problems. Maybe the plant already had the germ and with the heat, it developed.

---------- Post added at 06:59 PM ---------- Previous post was at 06:57 PM ----------

I don’t what is happening but I can’t put pictures
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Old 09-14-2018, 07:04 PM
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I am trying
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Old 09-15-2018, 03:31 PM
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Image - 1 looks like the leaf was bent over the edge of something. I would not have cut it.

Imate - 1 - 1 looks normal to me. I would not do anything.

Dangerous spots are soft and mushy and advance rapidly. When you poke, scratch or bend a leaf it gets damage and often turns black. Then it dries out. This is nothing to worry about.
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Old 09-15-2018, 09:40 PM
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What you see on the leaf is a fungus, at first it looks beige and sunken but it grows for hours, I had a few months ago a plant with three affected leaves and it was horrible how quickly it walks, I am very afraid of it. On that occasion I cut the three leaves and left one that had a speck as small as the tip of a pencil, there I put pysan and continued to grow, then I put daconil and nothing, in one day it reached the size of a coin, and another day I cut the leaf. I had the plant isolated for a month and a half, there were no more problems and now it is actively growing. These spots that I showed today on that plant, yesterday were almost invisible, today they were already sinking and enlarging, then cut the leaf and seal with cinnamon, I opened the stains with a scalpel and inside was the necrotic and dark tissue, all It tells me that it is black rot, what I do not understand how they acquire it, or maybe the germ was already dormant, it is the most acceptable.
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Old 09-17-2018, 09:58 AM
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Fungal spores are "everywhere", your plant does not necessarily have to come into contact with soil to contract fungus.

Either change your source for where you're getting your orchids or change the growing environment.

I do not know how the nursery your stock comes from grows their plants, but if they are coming out diseased like this pretty consistently, it would be a good idea to try out a different source to see if you get a different result.

You have no control over how the nursery treats their stock, but you have a fair amount of control over how you treat your own stock. Figure out the conditions for which the plant is growing in first, and then try to figure out ways to stop the problem.

One thing to try would maybe be to increase air circulation.

Another thing to try would be to see if the temperature in that growing area is low. Maybe find a place that is a bit warmer.

Try finding a place that is slightly brighter.

Look at the roots and see how they're doing. Maybe the roots are not in great shape.

When Cattleyas are healthy, they tend to be pretty sturdy. Problems like fungal diseases are quite rare.
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