LASERS, they are the bringers of doom. If you can't get lasers then napalm might do the trick. Just kidding, but really people are using high power Lasers and Nuking them with intense focused light. With a little safety, and some time you could kill all of them and any of their evil offsprings. Just my thought. I have tried everything their is. If you kill one with kalk paste 18 more will pop up and laugh at you. If you use Joes juice the same thing will happen. Matter of fact if you use any kind of control method other then burning them with high grade LASER's you will only find yourself overwhelmed by them.