Some kind of... rings/spots, on my dendrobiums. Bacteria? fungus?

[TheCook_66]

So these spots have been appearing on some of my orchids and hoyas. Problem is, some of the leaves that get heavily infected get mushy and drop off the plant . I am asking for advice on how to get rid of this disease, because it's been affecting not only my orchids, but also my hoya and... platyceriums? (not sure if it's because of the same pathogen, but hey, just in case). So please, if any of you guys can recommend a certain pesticide, I would like to try it out to see if it works. Thank you in advance

[Ray]

They look to be a bacterial infection - acidovorax, to be specific. I’d consider a copper based treatment, although some dens are supposedly sensitive to them.