I'm desperate for help in getting rid of a veritable plague of Mamosas. We just spent $5,000 having the 14 largest trees cut down but our yard and the neighboring property are still covered in thousands of tiny to large Mamosas. When you pull up the small ones or cut down the mid-sized ones, they just grow up again more profusely. And their roots spread deep and wide with new nodules producing new shoots. Our lawn is a basket case. Roundup Tough Brush Killer Plus will kill them but that's not a solution for the thousands that come up under the lawn or under favourite shrubs. HELP!