In the long-running war between farmers and weeds, it's advantage, weeds. Scientists in Kansas have found examples of the dreaded pigweed that are immune to the newest weed-killing technologies.
The Environmental Protection Agency has given farmers the OK to continue to spray the controversial weedkiller dicamba. The chemical is prone to blowing in the wind and damaging other vegetation.
Many farmers are defying efforts by regulators to strictly limit the use of dicamba, a popular weedkiller that's prone to drifting into neighboring fields.