For an efficient control of this species it is
important for a plant molluscicide to be effective
in all life stages of the target snail, being active on eggs, juvenile phases and adults. Besides, it has also
to fit other demands, such as easy access to the plant,
simple handling and preparation of the extracts, be
toxic in low concentrations, selective and harmless to
humans and to the environment (Ministério da Saúde
2008, Mott 1987, Singh et al. 1996, WHO 1965).