Palmer Amaranth, Amaranthus palmeri, thrives in hot weather, is tolerate of drought, and responds quickly to high levels of available nutrients. It competes aggressively against warm season crops, and is a prolific seed producer. A. palmeri populations have developed resistance to multiple herbicide modes of action, including ALS inhibitors, triazines, HPPD inhibitors, dinitroanilines, and glyphosate. This plant can have a greatly extended emergence period. Due to this extended emergence period producers must spend additional time and money to manage it.
To read more, download the free PDF from the Purdue Education Store.