[Preliminary screening tests of molluscicidal effect of extracts from Eucalyptus leaves].

OBJECTIVE

To investigate the molluscicidal effects of extracts from five Eucalyptus leaves collected from Guangdong Province, China.

METHODS

According to the WHO recommended indoor immersed method, the molluscicidal effects of extracts from five Eucalyptus leaves with 250, 100, 10 mg/L of water extraction, alcohol precipitation and organic solvent extraction were investigated.

RESULTS

The dose-effect relationship showed that all the mortality rates of Oncomelania hupensis reached 80% with the volatile oil from five Eucalyptus leaves immersed at the concentrations of 100 mg/L for 48 h, and the mortality rates were both 93.3% with the volatile oil from Corymbia citriodora and Eucalyptus urophylla leaves. The mortality rate was up to 95% with the chloroform extract, and the mortality rate reached 60% at the concentrations of 10 mg/L for 48 h.

CONCLUSION

The volatile oils from five Eucalyptus leaves and the chloroform extract in alcohol extraction from Eucalyptus urophylla leaves are better than other solvents.