Sentence:  For the control of slime-forming bacteria, slug additions of organo-mercurials (<WSD>Gallicide</WSD>, Puratized SC or PMA) and Preventol GDC (a dichlorodiphenyl compound) will prove effective. 
Meaning of the word marked with <WSD> tags:  The chemical phenylmercury monoethanolammonium acetate, used for the control of slime-forming bacteria in pulp and paper mills.