m0useanswered grow question 3 years ago Yup looks like PM
The dead wilting leaf in the top of the pic seems to be ignored.
You need to treat that plant asap or destroy it. I'm leaning toward the later.
stems tend to be green in healthy plants, something very wrong is going on in that grow.
And chances are its infected all the other plants if there are any. Disinfect the grow room
Good Luck