Table 2.
Insect antifeedant effects of nootkatone (1) and derivatives 2–23 against aphids.
| Product | M. persicae | R. padi | ||
|---|---|---|---|---|
| 50 (µg /cm2) a | EC50 b | 50 (µg /cm2) a | EC50 b | |
| 1 | 50.7 ± 9.1 | ~50 | 57.7 ± 10.2 | ~50 |
| 2 | 35.4 ± 9.0 | >50 | 86.0 ± 3.6 * | 17.4 (14.4–20.9) |
| 3 | 24.6 ± 7.5 | >50 | 77.1 ± 4.5 * | 27.1 (20.7–35.4) |
| 5 | 49.4 ± 10.9 | ~50 | 40.9 ± 8.2 | >50 |
| 6 | 57.2 ± 10.1 | ~50 | 30.7 ± 6.8 | >50 |
| 7 | 79.9 ± 5.4 * | ~25 | 30.8 ± 6.5 | >50 |
| 8 | 37.8 ± 9.8 | >50 | 31.4 ± 5.9 | >50 |
| 9 | 34.2 ± 8.5 | >50 | 44.2 ± 9.2 | >50 |
| 10 | 80.6 ± 4.8 * | 23.5 (16.6–33.3) | 36.95 ± 8.5 | >50 |
| 11 | 49.0 ± 9.4 | ~50 | 69.4 ± 7.6 * | ~25 |
| 12 | 59.1 ± 7.0 | ~50 | 51.8 ± 5.7 | ~50 |
| 13 | 29.0 ± 4.5 | >50 | 19.85 ± 6.5 | >50 |
| 14 | 91.2 ± 5.3 * | 30–40 | 83.8 ± 4.9 * | 30–40>50 |
| 15 | 54.5 ± 8.0 | ~50 | 78.81 ± 4.4 | 8.3 (5.5–12.7) |
| 16 | 63.9 ± 7.4 * | ~50 | 37.3 ± 7.3 | >50 |
| 17 | 40.6 ± 6.9 | >50 | 34.2 ± 7.9 | >50 |
| 18 | 60.4 ± 7.1 * | ~50 | 44.4 ± 9.0 | >50 |
| 19 | 35.4 ± 7.6 | >50 | 19.8 ± 5.6 | >50 |
| 20 | 92.1± 2.5 ** | 16.3 (13.6–19.7) | 93.9 ± 4.2 * | 7.1 (5.4–9.4) |
| 23 | 62.3 ± 9.2 | ~50 | 17.5 ± 6.7 | >50 |
a Percent settling inhibition (%SI, n = 100 insects). b Dose needed to give 50% settling inhibition (95% Confidence Limits). * Significantly different from the control (p < 0.05), Wilcoxon paired rank test.