I came in the garden after being gone for 5 days and noticed some white crumbs on the leaf. My original thought was powdery mildew. I looked at it under 60x and it just looked like crumbs possible drywall from the ceiling?
Guess I'll have to do a more thorough scan before lights come on.
All the microscope pictures of PM look fuzzy and cotton like.
This was more granular and was like a tiny piece here and there. I removed the leaves and examined them in my kitchen and the granules knocked off quite easily.
If I find more I'll take a picture and maybe someone who reads this and has experience can give me a clue.
Humidity controller is set to 55% and AC is at 75F