The perennial sedgeScirpus maritimusposes serious weed problems in flooded rice fields in the Philippines and other Asian countries. A number of chemicals seemed highly promising for controlling this perennial sedge in trials at the International Rice Research Institute and in farmers' fields in the Cagayan Valley, Philippines. Excellent control was obtained when butachlor was applied pre-emergence, followed by MCPP post-emergence. The selective chemicals bentazon and fenoprop gave outstanding perennial sedge control in both transplanted and broadcest flooded rice.