Abstract:

To explore a new molluscicide with molluscicidal activity against 〖WTBX〗Oncomelania hupensis〖WTBZ〗 and enhancing effect on rice growth,three MPFs including MPFN,MPFP and MPFK,mixing up  the power of 〖WTBX〗Macleaya cordata〖WTBZ〗 with nitrogenous fertilizer (MPFN),phosphatic fertilizer (MPFP) and potassic fertilizer (MPFK) respectively and the MCF,mixing up the power with the compounds of three fertilizers (N,P and K) were used in the experiment.The molluscicidal efficacy of MPFs and MCF on 〖WTBX〗O．hupensis〖WTBZ〗 and its effects on rice seedlings growth and seed germination were investigated under laboratory conditions.The results showed that in 200 mg/L concentration of MPFN, MPFP and MPFK,snails mortalities at 24 h were  100%,533% and 667%respectively. The percent of rice seed germination were 100%,80% and 53% in  200 mg/L concentration of MPFN,MPFP and MPFK.Therefore,the germination percents in  200 mg/L concentration of three MPFs were higher 60%,40% and 13% respectively than that in control (40% germination percent).The seedlings heights of rice were also  higher 1268%,707% and 605%  respectively than that in control.For MCFs,mortalities of the snails increased with the increase of the MCF concentrations and time.For example,mortalities of snails  were 733% and 867% at 48 h and 72 h in 200 mg/L concentration of MCF,and were 833% and 100% at 48 h and 72 h in 400 mg/L concentration of MCF.Seed germination and seedling height increased at lower concentration (200 mg/L) of MCF but decreased at higher concentration(400 mg/L) of MCF.In conclusion,MPFs had strong molluscicidal activities against〖WTBX〗 O.hupensis〖WTBZ〗 and improved seed germination and seedling growth of rice.The MPFN was the strongest one in the three MPFs.The MCF also had stronger molluscicidal activity against 〖WTBX〗O.hupensis.〖WTBZ〗But seed germination and seedling growth of rice  increased at lower MCF concentration (200 mg/L) and decreased at higher MCF concentration(400 mg/L