[Field evaluation of a novel plant molluscicide "Luo-wei" against the snail Oncomelania hupensis III molluscicidal effect by spraying method in hilly regions].
OBJECTIVE
To evaluate the molluscicidal effect of a novel plant molluscicide "Luo-wei" (Tea-seed distilled saponins, TDS) against Oncomelania httpensis in billy regions.


METHODS
The molluscicidal effect of TDS at a dose of 5 g/m2 by the spraying method against Oncomelania snails was assessed in a setting with a high snail density in Husban Village, Jiangning District of Nanjing City, and the effect was compared with that of 50% wettable powder of niclosamide ethanolamine salt (WPN) at a dose of 2 gIm2 at different time after spraying.


RESULTS
Afterl, 3, 7 and 15 day (days) of the spraying experiment, the snail death rates of the TDS group were 56.47%, 57.32%, 90.58% and 93.41% respectively, while those of the WPN group were 49.22%, 53.37%, 95.92% and 97.26%, respectively. The differences between the rates of the 2 groups 1, 7, 15 day (days) after the spraying were statistically significant (all P < 0.05). Fifteen days after the spraying, the density of living snails reduced from 20.30 +/- 16.20 snails/0.1 m2 and 23.67 +/- 21.22 snails/0.1 m2 to 2.28 +/- 2.17 snails/0.1 m2 and 1.27 +/- 0.76 snailsl0.1 m2 in the TDS group and WPN group, respectively, with the reduction rates of 88.77% and 94.63%, respectively.


CONCLUSIONS
TDS can be used as an alternative molluscicide for the control of Oncornelania snails in hilly areas, which deserves further popularization.
Jiangning District Center for Disease Control and Prevention, Nanjing City, Jiangsu Province, Nanjing 211100, China.
Yun
Y
Zhou
Jiangning District Center for Disease Control and Prevention, Nanjing City, Jiangsu Province, Nanjing 211100, China.
Zhi-mei
ZM
Wang
Jiangning District Center for Disease Control and Prevention, Nanjing City, Jiangsu Province, Nanjing 211100, China.
Biao
B
Zhang
Tang-shan Township Community Health Service Center, Jiangning District, Nanjing City, Jiangsu Province, China.
De-bing
DB
Xie
Tang-shan Township Community Health Service Center, Jiangning District, Nanjing City, Jiangsu Province, China.
Zhi-zhong
ZZ
Mei
National Institute of Parasitic Diseases, Chinese Centre for Disease Control and Prevention, WHO Collaborating Centre for Malaria, Schistosomiasis and Filariasis, China.
Tie-wu
TW
Jia
Jiangsu Institute of Parasitic Diseases, China.
Qing-biao
QB
Hong
Jiangsu Institute of Parasitic Diseases, China.
Le-ping
LP
Sun
D000818:Animals; D006801:Humans; D008975:Molluscacides / Q000494:pharmacology*; D009534:Niclosamide / Q000494:pharmacology; D011156:Population Density; D012503:Saponins / Q000494:pharmacology*; D012552:Schistosomiasis / Q000517:prevention & control*; D012908:Snails / Q000187:drug effects*
D008975:Molluscacides; D012503:Saponins; D009534:Niclosamide