I'm not to sure what that is bud i wanna say it looks like slim from a slug mixed with maybe Gnat Nix or some sort of sand? never seen it before sorry .
The leaf holes i would say the same problem as michael49 either Leaf Hoppers /crickets or Slugs try some neem oil or garlic oil if you wanna go all organic.
Fungicide soap or food grade Hydrogen peroxide mixed with water 1 a week isn't a bad idea either or if you wanna go the cheap route go with dish soap and warm water just remember you will have to wash your plants off after you use it . sorry i cant be off more help and i hope someone else who knows a lot more then i can help !!
Can only comment on what has worked for me as Fact all other info is opinion based or a straight up guess so for all the Trolls waiting to Roast me Fuck off !!