Table 2.
Mortality rate at 24 h, lethal concentration for 50% and 90% mortality of lemongrass EO and citral against R. flaviceps.
| Treatment | Conc. (μL/L) |
Mortality (%) ± SD at 24 h | LC50 a (LCL-UCL) | LC90 a (LCL-UCL) | Regression | χ2 b (d.f. = 4) | R2 c |
|---|---|---|---|---|---|---|---|
| Lemongrass EO | 0.14 0.16 |
0 e * 3.3 ± 2.9 e |
0.328 (0.222–0.391) | 0.595 (0.524–0.720) | y = 4.8167x − 0.655 | 3.685 n.s | 0.982 |
| 0.18 | 30.0 ± 5.0 d | ||||||
| 0.20 | 31.7 ± 5.0 d | ||||||
| 0.22 | 38.3 ± 7.6 cd | ||||||
| Citral | 0.14 0.16 |
6.7 ± 2.9 e 15.0 ± 5.0 e |
0.177 (0.171–0.185) | 0.214 (0.203–0.233) | y = 12.417x − 1.7383 | 32.464 n.s | 0.973 |
| 0.18 | 48.3 ± 2.9 c | ||||||
| 0.20 | 80.0 ± 10.0 b | ||||||
| 0.22 | 98.3 ± 2.9 a |
a LC50, LC90 = lethal concentration for 50% and 90% mortality with 95% confidence limit; LCL = lower confidence limit; UCL = upper confidence limit. b χ2 = chi-square value with α = 0.05. c R2 = regression coefficient. * The means in each row against R. flaviceps that are followed by different letters are significantly different (p < 0.05, by ANOVA and Tukey’s HSD Test). d.f. = degrees of freedom. n.s. = not significant (p > 0.05).