I have a degree in Bacti, but that was from the early sixties. What I think I remember about Pseudomonas is that it's stinky. Your professor is probably right, but maybe it is not on all rotting vegies.
Don't trust me, as I've a very poor sense of smell, diagnosed once with anosmia.
I gather you can't get to a medical library... or can you. There are probably useful books and articles about Pseudomonas online, so keep looking.