Roundup-Ready Ragweed

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Glyphosate-resistant Giant Ragweed Over-topping Roundup-Ready Corn. Photo by Dr. Bill Johnson.
Source: International Survey of Herbicide-Resistant Weeds.

The same website has a list of herbicides, ranked by the number of weeds that have evolved resistance to them.

From p. 4 of Darwinian Agriculture:

"Widespread use of transgenic crops resistant to the weed-killing herbicide (see glossary) glyphosate presumably increases the use of that herbicide, while reducing the use of other, more-dangerous herbicides, at least until weeds evolve resistance to glyphosate."

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