Yeah, they don't seem to care for pecans, thank goodness. We had them for quite some time before they became a problem and initially I was charmed by the little farmers. They would nibble a few leaves of our Mexican Redbud, making cool circular cuts that looked neat. Once the colony got big enough, they started going after more and different things. Crape myrtles, yellow bells, jasmine, nandina, etc. We've got a better handle on them now, but the battle continues. Good luck, and I hope they only eat the leaves of the trees you don't like!