Table 3.
Larvicidal activity of 2-methyl-1,4-naphthoquinone, 2-hydroxy-1,4-naphthoquinone and Device® SC-15 against Ae. albopictus third-instar larvae. 1
| LC50 (ppm) (LCL-HCL) 24 h |
LC90 (ppm) (LCL-HCL) 24 h |
χ2 (df) | LC50 (ppm) (LCL-HCL) 48 h |
LC90 (ppm) (LCL-HCL) 48 h |
χ2 (df) | LC50 (ppm) (LCL-HCL) 72 h |
LC90 (ppm) (LCL-HCL) 72 h |
χ2 (df) |
|---|---|---|---|---|---|---|---|---|
| 2-Methyl-1,4-naphthoquinone | ||||||||
| 24.2 | 39.4 | 35.8 a (23) | 14.5 | 20.7 | 11.6 (23) | 12.1 | 15.8 | 10.2 (23) |
| (21.6–27.1) | (35.3–45.4) | (13.5–15.6) | (19.1–22.9) | (11.5–12.9) | (14.7–17.7) | |||
| 2-Hydroxy-1,4-naphthoquinone | ||||||||
| 33.7 | 41.0 | 1.8 (23) | 31.9 | 39.2 | 0.8 (23) | 30.9 | 39.6 | 13.9 (23) |
| (31.2–38.0) | (37.0–48.5) | (29.3–38.4) | (34.5–52.0) | (28.8–34.1) | (35.9–46.1) | |||
| Device® SC-15 | ||||||||
| 50.6 | 95.3 | 60.2 a (23) | 36.4 | 90.6 | 43.4 a (23) | 15.0 | 58.9 | 26.2 (23) |
| (42.7–60.1) | (81.9–116.5) | (28.8–44.4) | (77.0–112.2) | (9.7–19.5) | (51.3–70.2) | |||
1 Probit regression analysis (LC50 and LC90) at 95% confidence interval, obtained in larvicidal test conducted with 2-methyl-1,4-naphthoquinone, 2-hydroxy-1,4-naphthoquinone and Device® SC-15 against Ae. albopictus third-instar larvae; LC50 = lethal concentration (ppm) that kills 50% of the exposed larvae; LC90 = lethal concentration (ppm) that kills 90% of the exposed larvae. a = Since goodness-of-fit test is significant (p < 0.05), a heterogeneity factor is used in the calculation of confidence limits (CL).