We had a problem with them. My wife got some 529 MSMA from Ace Hardware. At first in the spring she sprayed all the areas that they were at. Then when one would pop up she would spot spray it. The stickers can lay dormant for three yrs and then pop up. You will be working on this project for a few yrs. Mowing alot will help. I can't tell you how many garbage bags full of stickers we pulled up. Anything to keep the stickers from going to the ground. GOOD LUCK! We finally got rid of ours.
Rusty Kennedy '07 rubicon, shrockworks mid front bumper, shrockworks back bumper, warn 9.5ti winch, 2.5" bb, 35" KM 2's.