Interference for 40 d after emergence (DAE) of corn, cotton, peanut, andsnap bean by four glyphosate-resistant (GR) and four glyphosate-susceptible(GS) Palmer amaranth populations from Georgia and North Carolina wascompared in the greenhouse. Greater interference from Palmer amaranth,measured as crop height and fresh weight reduction, was noted in cotton andpeanut compared with corn or snap bean. Crop height 15 to 40 DAE was reducedsimilarly by GR and GS populations. Crop fresh weight, however, was reduced25 and 19% in the presence of GS and GR populations, respectively. Measuredas percent reduction in fresh weight, GR and GS populations of Palmeramaranth were controlled similarly by glufosinate, lactofen, paraquat, andtrifloxysulfuron applied POST. Atrazine and dicamba controlled GRpopulations more effectively than GS populations.
