"If you grow cotton in the Southeast, and you have Palmer amaranth in your fields, looking at side-by-side comparisons of resistant and non-resistant pigweed should scare you to death," North Carolina State weed scientist Alan York
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Herbicide resistant weeds are introducing a new problem to cotton farmers
http://www.non-gm-farmers.com/news_details.asp?ID=2730

Pesticide resistant weeds are introducing a new problem to cotton farmers. Traditionally, herbicide resistance is dealt with by simply changing the herbicide. But according to North Carolina State weed scientist Alan York, farmers are running out of options: there are no more effective pesticides to switch to. The majority of farmers in the Cotton Belt are now growing Monsanto's genetically engineered Roundup Ready cotton, which is resistant to glyphosate pesticides. As a result of the heavy use of glyphosate in the area, varieties of pigweed have developed an immunity to it. Tests at the University of Georgia showed that the pigweed Palmer Amaranth has developed amazing resistance to glyphosate. Scientists doused the weeds three times with a quadruple concentrated dose of glyphosate, but the pigweed continued to grow and multiply. "If you grow cotton in the Southeast, and you have Palmer amaranth in your fields, looking at side-by-side comparisons of resistant and non-resistant pigweed should scare you to death," York says. http://www.organicconsumers.org/ge/cotton060404.cfm