Well, if its bugs you'll be able to tell with a loop a micro. You'll see where bit it'll be all dried up like a broken part of the leaf.
Most of it looks like mutations, but I seen you had some bug probs but for them size holes you really would catch a slug or cat and you'll c a slim trail with a slug. Anyways crushed glass or salt, sea if you have it but table salt works fine too.
For the lil shits look into something organic and that will help the growth stage throughout. Like canna cure. You can apply it before bugs come as a pre defence.
Anyways, good luck.