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Published online by Cambridge University Press: 12 June 2017
Water lettuce (Pistia stratiotes L.) was susceptible to applications of 6,7-dihydrodipyrido(1,2-a:2’,1′-c)pyrazidiinium salt (diquat). The most satisfactory rates of application were 1.0 to 1.5 lb/A of diquat. The addition of a surfactant did not increase the effectiveness of diquat. Several other chemicals gave unsatisfactory control of water lettuce.