Is this Erwinia?

[greenhouseFrog]

This yellowing wet spot on this Oncidium’s new growth eluded me until today—upon discovery, I noticed it had spread down into the crown of the new growth, as well as towards its base. The yellow portions are smelly and mushy—the bigger leaf kind of sloughed off after the pictures

Should I just remove the infected growth as cleanly as possible and douse the remaining(hopefully uninfected) plant in something like Physan? Also, should I spray down everyone else that was in proximity of this one?

Thank you in advance for your input!