The “bits” don’t look like wpm.
This could be the start of it. It’s hard to tell.
I believe I’ve successfully eliminated wpm from a couple plants in veg using green cure. They haven’t finished flowering yet, so far so good.
Some people swear by h2o2, but it didn’t completely eliminate it on my plants.
I have yet to be able to get rid of it when the plant is in flower, (since green cure isn’t recommended for flowering plants).
Here’s the link to the thread. It’s still ongoing.