Table 1.
Molluscicidal activity of 4% TDS against Oncomelania hupensis, Biomphalaria alexandrina and Bulinus truncatus by the immersion test in the laboratory
| Snail species | Time (h) | N a | n | Slope ± SE | χ 2 b | LC50 (95% CI) | LCR50 (95% CI)c |
|---|---|---|---|---|---|---|---|
| Oncomelania hupensis | 24 | 9 | 270 | 3.522 ± 0.445 | 4.290 | 0.701 (0.581, 0.842) | Reference |
| 48 | 9 | 270 | 4.730 ± 0.675 | 5.073 | 0.371 (0.315, 0.436) | 1.891 (1.484, 2.411) | |
| 72 | 9 | 270 | 5.514 ± 0.868 | 2.097 | 0.330 (0.284, 0.385) | 2.125 (1.680, 2.687) | |
| Biomphalaria alexandrina | 24 | 9 | 270 | 8.043 ± 0.910 | 4.576 | 1.975 (1.868, 2.092) | 0.355 (0.293, 0.430) |
| Bulinus truncatus | 24 | 9 | 270 | 9.014 ± 0.929 | 4.154 | 1.396 (1.312, 1.477) | 0.502 (0.414, 0.609) |
aN, number of dose groups (excluding control); b Goodness of fit tested by chi-square, all P values were more than 0.5 (degrees of freedom were 7); c LCR50, lethal concentration ratio at 50% response level (compared with LC50 of O. hupensis at 24 h exposure, LCO. h/LCB. a or LCB. t.). If the 95% confidence interval of LCR50 includes 1, then the LC50s are not significantly different