Pseudobulbs of cattleyas rotting due to excess water

[Merita]

Hello everyone: I need help, I have rot in the pseudobulbs of mature plants of cattleyas, which I bought about a month ago and transplanted them, they are growing new roots, but they have dropped a lot of water. What fungicide I should apply after cleaning them; the physan is not working, the inococur either, I'm just applying cinnamon, I would appreciate your advice, greetings.

[rbarata]

Photos...we need photos!

Thank you

[Ray]

Physan is a topical antiseptic; it will do nothing for a systemic infection.

Inocucor IS systemic, but you need to give an extended soak (overnight) in a 1:50 dilution, then keep spraying the plant an medium with it a couple of times a day to build up the microorganism population. If you used the Physan after the Inocucor, or used Inocucor within a couple of weeks of a Physan treatment, it will kill all the microorganisms and render the Inocucor product no good whatsoever.

[Merita]

already cut them about two days ago, I do not know if I reach the rhizome because they are very deep. This started with a yellow leaf that I cut and put cinnamon, then the pseudobulb started to turn yellow and at the end it was like beige but not soft. cut until what I could and down was more rotten and I had applied physan had done treatment with inococur when the transplant, is the second that starts with the same, I think there must be some fungicide not as expensive as the subdue, which can be applied or I would not have another alternative to buy this, I am not sure that they are fungi oomycetes, here the rain is almost every day and the soil is saturated, many plants in the garden are dying. This is the plant after applying cinnamon.

[Orchid Whisperer]

That photo is too tiny to be able to see details.

One detail that you indicated is the amount of rain you are getting. A plant that has a bacterial or fungal rot problem will be easier to treat if it is not out in the rain, and watered only when you want it to get water.

The pot that the plant is in seems very large for the plant. I would suggest taking it out of that pot. Hang the bare root plant somewhere in the shade, not exposed to rain. See if the pseudobulbs stop rotting, check daily, cut off any pseudobulbs and rhizome where the rot seems to keep spreading. When the spread seems to stop, continue to keep the plant dry, keep it bare root, keep observing.

During dry weather, you can introduce it back into more normal light, you can mist just the roots, not the rhizome, early in the day, once or twice a week. Keep it bare root. Still keep checking for rot you may have missed, daily if you can, but at least every other day.

The newer growths, and some of the older roots, should start making new roots. As long as rot has not returned, you can now repot. Use the smallest pot you can, with coarse fast-draining medium, I recommend un-glazed terracotta pots. pot with the rhizome exposed, above the medium, not buried beneath it. Water thoroughly each time, allow medium to dry in between watering.

You will notice that I did not recommend Physan or other concoctions. They are not needed, and are not a substitute for good culture.

[Ray]

As OW said, it's difficult to tel much from that photo, but frankly, what I CAN see looks pretty good.

Could it simply be old growths that are giving up the ghost?

[Ray]

Deleted duplicate post

[Ray]

As OW said, it's difficult to tel much from that photo, but frankly, what I CAN see looks pretty good.

Could it simply be old growths that are giving up the ghost?

[WeirdGuySeattle]

As somebody who goes through an orchid obsession in waves, I've let some of my favorite cattleyas get rot and then perform a rescue, and let them grow well for another 15 years.

The rescue I usually do involves a good repotting in a new (usually smaller) pot, looking for pests, making sure I have a fan blowing air around, and otherwise normal / good culture (proper temps being the next most important to stopping rot). The plant will outgrow the rot, and newer leaves should come out fine.

Yours being outdoor, I'd probably just look at pot / medium and the rest should be fine - your plant actually looks pretty good.

[Merita]

Thank you. That's what I did with the first plant, then the others I cut the pseudobulbs that were rotting because I had transplanted them last month, I put cinnamon, and they are taking new roots, I need no more rain. Regards