thc tastes like crap, grasshoppers like to eat the leaves but i have never had a problem with them eating the buds, there is a kind of grub though that likes to live in the stem and eat it's way through the bud, people call them "thc grubs" but im pretty sure they are some kind of acorn grub, they can often be found in bags of fresh outdoor weed, sometimes still alive. i don't know how to kill them and have had them many times, i wouldn't use any pesticides if i were you, once it starts budding, that could be very dangerous if you happen to smoke it with somone who is allergic to any number of the numerous chemicals in those things.