I recommend the Amazing Dr. Zymes. It's a one-spray-kills-all fungicide/pesticide and I can't recommend it enough. You can even use it in flower or right before you harvest, which I think is great. Pests and powdery mildew don't stop attacking your plants just because they are flowering.
To answer your question:
Something is definitely
Chomping on your plant. BT spray is also a great option to kill pests, but it only takes care of bugs that chew on your plants. So, keep that in mind.
If you don't have any Dr. Zymes, here's a link for some free samples and a cool pin. You just have to pay shipping.
www.doctorzymes.com/wizard
I hope this helps.