Table 4.
Toxicity of mixtures with different LC50 ratio of Ligusticum chuanxiong oil (LCO) and lemongrass oil (LO) against Aphis citricola van der Goot (24 h).
| LCO LC50 (%) | 100 | 90 | 80 | 70 | 60 | 50 | 40 | 30 | 20 | 10 | 0 |
| LO LC50 (%) | 0 | 10 | 20 | 30 | 40 | 50 | 60 | 70 | 80 | 90 | 100 |
| Actual mortality (%) | 52.11 | 62.5 | 62.62 | 56.31 | 51.94 | 54.76 | 49.46 | 51.09 | 48.02 | 48.5 | 48.02 |
| Theoretical mortality (%) | 52.11 | 51.70 | 51.29 | 50.88 | 50.47 | 50.07 | 49.66 | 49.25 | 48.84 | 48.43 | 48.02 |
| Poison ratio | 1 | 1.21 | 1.22 | 1.11 | 1.03 | 1.09 | 1.00 | 1.04 | 0.98 | 1.00 | 1 |
LC50 values of LCO and LO were 128.78 and 169.59 mg/L, respectively. In this study, the LC50 values of LCO and LO were set at 130 mg/L and 170 mg/L, respectively.