Table 4.
Activity of isobutyrylshikonin (1) on 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 | 37.9 ± 5.8 | 92.8 ± 7.3 | 2.69 (2.25–3.17) |
15.55 (11.67–18.93) |
5.362 | 20.8 ± 7.5 | 94.4 ± 3.8 | 6.65 (3.95–8.12) |
13.16 (12.97–15.89) |
2.555 |
| 6.8 | 24.1 ± 7.2 | 67.8 ± 5.9 | 12.9 ± 3.2 | 33.6 ± 7.2 | ||||||
| 3.4 | 31.1 ± 5.9 | 57.1 ± 3.9 | 15.1 ± 4.4 | 21.3 ± 5.9 | ||||||
| 1.7 | 6.9 ± 3.8 | 35.6 ± 4.9 | 2.1 ± 0.8 | 3.3 ± 2.1 | ||||||
| 0.8 | 10.3 ± 5.5 | 21.4 ± 5.2 | 0.0 ± 0.0 | 0.0 ± 0.0 | ||||||
| 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 (LD90) = dose in μg·cm−2 causing 50% (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.