eric,

The annual Roundup bath is creating superweeds just as predicted. In the Red River Valley of the North, farmers often rotate Roundup Ready soybeans with wheat, this spring which was wet, a lot of wheat did not come up on last year's RR soybean fields, these fields had to be replanted. In my opinion, in certain growing conditions, Roundup is also carrying over to the next growing season killing any crops without genetic engineered resistance to Roundup.

Arkansawyer

Yes. RoundUp is just like antibiotics.

Soon RU will be used sparingly. Just like TB strains/staff are
resistant to antibiotics, Johnson grass, cocklebur,
pigweed will be coming back.

As well as some virulent cornworms and boll weevils.

Wired Magazine ran an article in their November 2004 issue about the appearance of a coca plant in Colombia that showed resistance to glyphosate (the RoundUp pesticide):

http://www.wired.com/wired/archive/12.11/columbia.html

The U.S./Colombia authorities have never publicly acknowledged its existence, but according to the article, all the growers in Colombia have switched to "Boliviana negra" -- the "Roundup-Ready" coca. Apparently, the original plant was discovered in a sprayed field, and cuttings were made from it, and were grown out like crazy. Seems it was a naturally-occurring mutation -- no signs of genetic manipulation. So much for Plan Colombia...

planned obsolescence by evolution.