The reproductive activity of Biomphalaria glabrata exposed to Euphorbia splendens
latex was evaluated. Parameters related to fecundity and fertility were observed. The snails were exposed to the LD50 (1 mg/l) of crude latex. At the first week post exposure (p.e.), the egg laying was reduced. After the fourth week p.e., an increase of the number of eggs/snail occurred. The results showed a marked reduction in the hatching of the snails, revealing an interference of latex exposure with the reproductive process of B. glabrata
of E. splendens
. The LD50 of the latex may be used as an alternative method to control the size of the populations of B. glabrata in field.