Fungal rot on a Bulbophyllum treschii?

[Zindaginha]

Last week I received this Bulbo treschii that wasn't in the greatest shape, but I'm not sure how serious it is. It has this worrisome spot on one leaf, almost all the roots seem dead (not suqishy, though) and then there are these two psuedobulbs that are blackish with brown leaves coming out.

Is this a fungal infection? If so, how would I treat it?

[Zindaginha]

Pics would help, probably!

[estación seca]

Newer growth on Bulbos turna black when they don't get enough water, or when they get too cold/hot. I'm not familiar with this one. Was it shipped? How cold is it where you live, and its journey?

[Jason Barrette]

Judging by your pictures, the roots look to me like they went through a severe dry spell. I’m not familiar with your species but the pbulbs look somewhat shriveled for a Bulb as well. I would clean (peel) the dead bract covering the pbulbs that have the rot on them and make sure that it’s in a location with decent air flow. If the pbulbs that have the fungus are hard, then there’s life in them. Any of my Bulbophylums that aren’t in decent air flow get that fungus on the dead bract because the potting mix is usually damp. I would also cut off any of the roots that are desiccated before repotting and clean them with your favorite antifungal spray. I use hydrogen peroxide.

[Zindaginha]

Originally Posted by estación seca

Newer growth on Bulbos turna black when they don't get enough water, or when they get too cold/hot. I'm not familiar with this one. Was it shipped? How cold is it where you live, and its journey?

Thanks! I bet that is what happened--yes, this plant was shipped and has been on a long journey, in fact. If cold and dryness is the problem, then hopefully being in my grow shelf, which has temps of 75-80 degrees and RH around 80% will be good for it. I have now re-potted it in a terra cotta pot with styrofoam peanuts and a bit of coconut coir, to give it as much air as possible while also keeping the roots humid.

---------- Post added at 06:50 PM ---------- Previous post was at 06:46 PM ----------

Originally Posted by Jason Barrette

Judging by your pictures, the roots look to me like they went through a severe dry spell. I’m not familiar with your species but the pbulbs look somewhat shriveled for a Bulb as well. I would clean (peel) the dead bract covering the pbulbs that have the rot on them and make sure that it’s in a location with decent air flow. If the pbulbs that have the fungus are hard, then there’s life in them. Any of my Bulbophylums that aren’t in decent air flow get that fungus on the dead bract because the potting mix is usually damp. I would also cut off any of the roots that are desiccated before repotting and clean them with your favorite antifungal spray. I use hydrogen peroxide.

Thanks! The same shipment contained two other bulbos (rotschildianum and collettii), both of which have pbulbs that are plump, apple green and smooth, so something's off with the b. treschii.

I will check the black pbulbs and see how firm they are and do the H2O2 spritz, as you suggest, though it now sounds like maybe not fungus (fingers crossed!).