Catarpillar:
-You can buy Safer's Soap for about $10 at your local hardware store
-You can buy Neem Oil for about $10 at your local hardware store

^I would recommend one of the two or both if you have the money (they are both nature but I'm not sure if it will completely stop the problem but it will help)

Along with that I would recommend buying an insecticide or caterpillar repellant/killer BUT BE CAREFUL. Make sure you spend the extra time/money looking for one that YOU can ingest without it killing you because someone is gonna be smoking it later right?

So one of the two sprays and the caterpillar repellant or all three.

Try spraying once every three or so days until you notice the problem has died down. Then just use the neem/safer's soap around once a week. Make sure you spray the bottom of you leaves.

=) good luck.
Maybe someone more experienced can add something :jointsmile:

Stop using chem's about 1-2 weeks before harvesting =P