These things caused me the biggest headache trying to get my moringa trees going. I thought it was rabbits considering how much would disappear overnight. The closest thing I have found to a solution is to have a bunch of whatever you are trying to grow, enough that they can't eat it as fast as it recuperates. They seem to eat one thing for a while and then move on to something else.

And isn't there something to do with aphids in their nest involved? Some sort of symbiosis?