“…The herbicide endothall [7-oxabicyclo(2.2.1)heptane-2,3-dicarboxylic acid] has been found to be particularly effective against certain submersed aquatic weeds (Frank et al, 1961;Walker, 1963). Presently, very little is known about the metabolism of this herbicide by aquatic microorganisms; however, a few workers have investigated its persistence in soil.…”