Table 5.
Activity of isovalerylshikonin against Tetranychus urticae mites.
| Dose (μg·cm−2) | Adults | Nymphs | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 2nd Day a | 5th Day a | LD50 b (CI95) | LD90 b (CI95) | Chi c | 2nd Day a | 5th Day a | LD50 b (CI95) | LD90 b (CI95) | Chi c | |
| 13.5 | 75.8 ± 5.8 | 100.0 ± 0.0 | 1.06 (0.89–1.26) |
4.15 (3.43–5.32) |
3.121 | 20.8 ± 7.5 | 100.0 ± 0.0 | 1.65 (0.61–2.82) |
6.67 (5.98–8.16) |
1.292 |
| 6.8 | 44.9 ± 5.2 | 96.4 ± 2.6 | 12.9 ± 3.2 | 94.4 ± 3.5 | ||||||
| 3.4 | 24.2 ± 3.9 | 82.1 ± 6.2 | 15.1 ± 4.4 | 61.8 ± 3.2 | ||||||
| 1.7 | 20.7 ± 5.1 | 71.4 ± 5.5 | 2.1 ± 0.8 | 48.7 ± 2.1 | ||||||
| 0.8 | 1.1 ± 0.1 | 39.2 ± 4.9 | 0.0 ± 0.0 | 32.2 ± 2.5 | ||||||
| Control | 9.6 ± 0.2 | 9.6 ± 0.2 | 16.6 ± 3.3 | 18.5 ± 1.3 | ||||||
a Mortality (% after correction by Abbott) of adults or nymphs ± standard deviation (S.D.); b LD50 and LD90 = dose in μg·cm−2 causing 50% and 90% mortality of adults and nymphs T. urticae; CI95 = 95% confidence intervals, the activity is considered significantly different when the 95% CI fail to overlap; c Chi-square value, not significant at p > 0.05 level.