The latest way to get rid of them. No more chemicals or massive machines. Just get a herd of goats. They munch the bad stuff and provide milk, butter, and cheese.
Personal story: When I was very young, I spent two weeks at a summer camp run by Roy Rogers and Dale Evans. Not only movie stars but very religious people who loved children. They also loved goats and had a whole lot of them. Some 65 years later, I can still remember the different taste of goat products, to include the meat.
Just be careful. They are very agile and you might find one like this:
Read the interesting story @ BBC News - The goats fighting America s plant invasion