What is this a sign of?

[BobbyDigital]

Here it is

@Jbum

I did what @Myfriendis410 suggested. Use 3% H2O2 just before lights out and spray really good especially under the leaves. Then follow up 48 hrs later with Captain Jacks bug killer the same way. Then repeat 5 days later H2O2 then 48 later with the Captain Jacks. That did it for me no more mites here.