Objective To evaluate the snail control effect of 4% powder of niclosam ide ethanolamine salt in the field.Method A grassland with high er snail density was selected,4% niclosamide powder was dusted by machine and th e dosages in three experimental groups were 25g/m2, 50 g/m2, 75 g/m2 respe ctively. Meanwhile, 50% wettable powder of niclosamide ethanolamine salt w as sprayed as control group. The molluscacidal effect was evaluated 3, 7, and 15 days after experiment.Results In 25 g/m2, 50 g/m2 and 70 g /m2...