Not sure about the glyphosate, but it could be a tactic by the chem companies. Most farmers are using binrun Roundup ready beans without paying any royalties. This might be a way to get back at the farmers, I don't know.

Here is a website from Brazil with a bunch of blogs by american farmers in brazil. Very interesting. Check the left hand site for links to other blogs.

http://www.brazil.studyintl.com/korymelby.htm