Sulfur Residue or PM?

Is it PM of sulfur residue?

  • Powdery Mildew

    Votes: 1 20.0%
  • Sulfur Residue

    Votes: 4 80.0%

  • Total voters
Hey everyone,
I have searched and cannot figure out what is on my leaves. I am hoping someone here can help. I had someone cover my grow for 9 days and when I got back all of my plants have this (pictured) on the leaves. I did not have any signs of powerdy mildew before. I had my help spray the plants with Sulfur. This is the first time I’ve used this and don’t know if the leaf has a residue from the spray or if I’m 9 days PM has taken over my room. Has anyone seen this before?
I am new so I would wait for others to comment but I do have a question for you. Have you tried foliar spray of just water to see if some of the white runs off the leaves?
I'm new to this, but based on what I've had on houseplants before, that looks like the dreaded white fungus. I hope not. @Mr.jiujitsu, what sort of scope would be required?
That's just residue from the powdered sulphur. 100%. You can see how its formed where there were water droplets. My plants look exactly the same when I spray them with wettable powdered sulphur. Looks like good coverage too. Help done good.