![Palmer amaranth can reach heights of up to 7-10 feet. UGA Extension weed specialist Eric Prostko encourages farmers to continue to control Palmer amaranth even after their corn is harvested.](https://secure.caes.uga.edu/news/multimedia/images/1295/Palmer-low-res.jpg)
Chemistry Rotation
A University of Georgia professor is advocating that farmers rotate the pesticides they apply to cotton crops in order to prevent another outbreak of the herbicide-resistant weed, Palmer amaranth.