It has the ability to be resistant to many different herbicides. It is proving to be a headache to cotton producers across the south. The populations found in Delaware are not herbicide resistant at this point. Dr. Van Gessel notes it is important that we identify it early and aggressively start to manage it before it becomes a problem. The University of Georgia has a fact sheet on the biology of Palmer Amaranth . Kansas State University has a guide to help in identification of Palmer Amaranth .