Molluscicidal effect of 25% wettable powder of pyriclobenzuron sulphate in hilly schistosomiasis-endemic regions
10.16250/j.32.1374.2021191
- VernacularTitle:吡螺脲硫酸盐可湿性粉剂在山丘型血吸虫病 流行区的灭螺效果
- Author:
Ze-lin ZHU
1
;
Bing-rong LUO
2
;
Yu-hua LIU
2
;
Yu-wan HAO
1
;
Tian TIAN
1
;
Qiang WANG
1
;
Li-ping DUAN
1
;
Shi-zhu LI
1
Author Information
1. National Institute of Parasitic Diseases, Chinese Center for Disease Control and Prevention, Chinese Center for Tropical Diseases Research, WHO Collaborating Centre for Tropical Diseases, National Center for International Research on Tropical Diseases, Ministry of Science and Technology, National Health Commission Key Laboratory of Parasite and Vector Biology, Shanghai 200025 China
2. Dali Bai Autonomous Prefecture Institute of Schistosomiasis Control, Yunnan Province, China
- Publication Type:Journal Article
- Keywords:
Oncomelania snail;
Pyriclobenzuron;
Molluscicidal effect;
Fish toxicity
- From:
Chinese Journal of Schistosomiasis Control
2022;34(4):404-406
- CountryChina
- Language:Chinese
-
Abstract:
Objective To evaluate the molluscicidal effect of 25% wettable powder of pyriclobenzuron sulphate (WPPS) against Oncomelania snails in hilly schistosomiasis-endemic regions and test its toxicity to fish. Methods In October 2020, a snail-infested setting which had been cleared was selected in Nanjian County, Yunnan Province and divided into several blocks, and the natural snail mortality was estimated. 25% WPPS was prepared into solutions at concentrations of 1 and 2 g/L, and 25% wettable powder of niclosamide ethanolamine salt (WPNES) was prepared into solutions at a concentration of 2 g/L. The different concentrations of drugs were sprayed evenly, and the same amount of water was used as blank control. Snails were surveyed using the systematic sampling method 1, 3 and 7 days post-treatment, and snail survival was observed. A fish pond was selected in Nanjian County, and 2 kg 25% WPPS was evenly sprayed on the water surface to allow the effective concentration of 20 g/L. Fish mortality was estimated 8, 24, 48 and 72 h post-treatment. Results One-day treatment with 1 and 2 g/L WPPS and 2 g/L WPNES resulted in 97.99%, 97.99% and 94.11% adjusted snail mortality rates (χ2 = 3.509 and 3.509, both P values > 0.05), and the adjusted snail mortality was all 100% 3 d post-treatment with 1 and 2 g/L WPPS and 2 g/L WPNES, while 7-day treatment with 1 and 2 g/L WPPS and 2 g/L WPNES resulted in 91.75%, 86.57% and 57.76% adjusted snail mortality rates (χ2 = 14.893 and 42.284, both P values < 0.05). Treatment with 2 g/L WPPS for 72 h resulted in a 0.67% cumulative mortality rate of fish. Conclusion 25% WPPS is effective for snail control and highly safe for fish, which is feasible for use in hilly schistosomiasis-endemic regions.
