To study the molluscicidal mechanisms of the
Alternanthera philoxeroides.After snail being treated with Alternanthera philoxeroides
and dechlorinous water for 12h、18h and 24h,the changes of the shape and the structure of the tissues of Oncomelaia hupensis were observed by using
scanning electron microscope(SEM).Results showed that the snail's muscle linking the foot muscle with the shell was clearly contracted;the shape and structure of the other tissues of the snail were similar to that in the normal after treated with
Alternanthera philoxeroides for 12h.The snail's muscle linking the foot muscle with the shell was contracted and slightly swollen,the surface muscular fold of the head and the antenna became flat,the villous process of the foot's muscles were disorder and the some of them were loss,the liver was slightly enlarged and coalescence in some regions after treated with Alternanthera philoxeroides for 18h.Some of snail's muscle fibers linking the foot muscle with the shell were sunder,the shape and structure of the head and antenna and foot's muscle and liver and others tissues of the snail were apparently destroyed after treated with Alternanthera philoxeroides for 24h.Conclusion presents Alternanthera philoxeroides can cause the contraction of the snail's muscle linking the foot muscle with the shell and destroy the tissues of Oncomelaia hupensis,which is linked with the time of the treatment.