Weed resistance is a growing concern among row crop producers. Currently, Palmer amaranth is resistant to glyphosate, ALS-inhibitors and DNA herbicides. The three effective modes of action for Palmer amaranth are glufosinate, PPO-inhibitors, and growth regulators. This survey determines the levels of Palmer amaranth resistance to these herbicides present in South Carolina soybean production. Research intends to collect Palmer amaranth seed samples across the state and conduct greenhouse herbicide screens for levels of resistance to glyphosate, glufosinate, PPO-inhibitors, ALS[1]inhibitors, 2,4-D, and dicamba. Then, efforts aim to disseminate these research results to South Carolina farmers to support decisions about managing Palmer amaranth in soybeans and all rotational crops.

Key Benefactors:
farmers, agronomists, extension agents