Table 5 Acaricidal and repellent activities of 3,7-dimethyl-2,6-octadienal and its similar structures against H. longicornis unfed nymphs and adults
Compounds | Life cycle | Acaricidal activitya | Repellent activityb | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
LC50 (mg/ml) (95% CL) | LC90 (mg/ml) (95% CL) | Slope ± SE | χ2 value (df, p) | Treatment median (s) | Negative control median (s) | P valuec | Treatment/negative controld | Median difference (s)e | ||
Octanal | Nymphs | > 80 | – | – | – | 15.0 | 13.5 | n.s.f | 1.1 | 1.5 |
Adults | > 80 | – | – | – | 7.5 | 7.0 | n.s | 1.1 | 0.5 | |
2-Octenal | Nymphs | > 80 | – | – | – | 23.5 | 12.0 | < 0.05 | 2.0 | 11.5 |
Adults | > 80 | – | – | – | 14.0 | 7.5 | < 0.05 | 1.9 | 6.5 | |
2,4-Octadienal | Nymphs | > 80 | – | – | – | 28.0 | 13.0 | < 0.05 | 2.2 | 15.0 |
Adults | > 80 | – | – | – | 16.0 | 7.0 | < 0.05 | 2.3 | 9.0 | |
3,7-Dimethyl-6-octenal | Nymphs | > 80 | – | – | – | 71.5 | 12.0 | < 0.01 | 6.0 | 59.5 |
Adults | > 80 | – | – | – | 42.5 | 8.0 | < 0.01 | 5.3 | 34.5 | |
3,7-Dimethyl-2,6-octadienal | Nymphs | 32.58 (27.75–37.84) | 67.19 (55.41–88.11) | 4.08 ± 0.56 | 6.162 (6, 0.405) | 160.5 | 16.0 | < 0.01 | 10.0 | 144.5 |
Adults | 41.06 (35.79–46.10) | 71.27 (61.39–91.18) | 5.35 ± 0.85 | 3.392 (6, 0.758) | 96.0 | 9.5 | < 0.01 | 10.1 | 86.5 | |