Rhizoctonia AND Botrytis? What am I doing wrong?

[RealKaseyGrant]

Hello again! I'm fighting something here, I'm not sure what it is or if it is multiple things.

So, I thought some of my phals had rhizoctonia. The root rot was aggressive and the leaf yellowing matched the symptoms in my research. I lost one but managed to save 3 others, I think.

Then I noticed my zygo and cycnodes getting yellow leaves. The phals and the zygo had been repotted recently, so that didn't really surprise me. The cycnodes was next to the zygo with leaves touching a bit. I quarantined all of them and did Physan drench while awaiting a systemic antifungal, which I got last night.

Then I noticed that my phrag had weird spots on its newly bloomed flower, which promptly proceeded to fall off this morning.

Now, it is still warm, like 80 degrees most of the day, in my orchid room. Maybe gets down to 68-75 at night if I don't open the door to cool the room. I have multiple fans going 24/7, and the humidity is @50%. I have multiple full spectrum + UV and IR grow lights that are synced to the actual sunrise and sunset. So, I don't understand what l'm doing wrong. Botrytis AND rhizoctonia? Really? 😭 Does anybody have any suggestions? I use Quantum Orchid for beneficial bacteria and mycorrhizae, too. I don't know. I'm lost. Any help is appreciated. TIA!

[Ray]

It sounds like your growing area may be contaminated, which can reinfect plants.

Have you tried disinfecting the room, benches, etc.?

[estación seca]

Botrytis is a disease of very cool temperatures plus very high humidity. I don't think it's likely with your conditions.

Rhizoctonia tends to be a disease of plants with roots suffocating in old, decaying media. How long since they were repotted?

How long the Phrag. flower been open?

How close to the lights are your Phals? They prefer lower light than the other orchids you mentioned. High light will cause leaf yellowing.

Did you repot the Cycnoches while in leaf? It's better to repot them only when dormant, or many roots are damaged.

[RealKaseyGrant]

Originally Posted by Ray

It sounds like your growing area may be contaminated, which can reinfect plants.

Have you tried disinfecting the room, benches, etc.?

So, I am doing this in my home, and I use a repotting mat, that gets cleaned and disinfected along with tools, in an office for anything that might get messy. Otherwise, they just sit on shelves. I've never had any of these things before to my knowledge either.

---------- Post added at 07:25 PM ---------- Previous post was at 07:19 PM ----------

Originally Posted by estación seca

Botrytis is a disease of very cool temperatures plus very high humidity. I don't think it's likely with your conditions.

Rhizoctonia tends to be a disease of plants with roots suffocating in old, decaying media. How long since they were repotted?

The phals and zygo had just been repotted within the month. I've never seen anything like it. The roots almost looked like they were liquefying through the clear pots. It was crazy. The leaves looked identical to an AOS webinar on disease, though.

How long the Phrag. flower been open?

3 days

How close to the lights are your Phals? They prefer lower light than the other orchids you mentioned. High light will cause leaf yellowing.

Yes, but these were yellowing and falling off within a couple days. My phals have the weakest lights at about 12-24 inches. The DLI is about 8-12 across the map.

Did you repot the Cycnoches while in leaf? It's better to repot them only when dormant, or many roots are damaged.

I've never repotted it. I just got it this year, and it's been in leaf the whole time. No problems until now. It just started getting new root growth within the past week. I don't know what's going on. I'm going crazy. Thank you!