Table 4 Larval growth index (LG) of 2nd instar Spodoptera littoralis larvae fed for 72 h on treated castor bean leaves by Melaleuca alternifolia EO, terpinen-4-ol, and γ-terpinene at different concentrations
Treatment | Concentration (mg/L) | Pupation (%) | Larval growth index (LGI) |
|---|---|---|---|
Melaleuca alternifolia | 4000 | 30.0 ± 1.5 g | 1.08 |
2000 | 42.1 ± 4.6f | 2.23 | |
1000 | 48.7 ± 2.3e | 2.51 | |
500 | 55.3 ± 1.7d | 3.36 | |
250 | 61.5 ± 2.2c | 3.59 | |
Terpinen-4-ol | 4000 | 46.9 ± 3.6d | 1.86 |
2000 | 51.4 ± 3.0d | 2.54 | |
1000 | 57.4 ± 1.8c | 2.93 | |
500 | 68.2 ± 4.1b | 4.65 | |
250 | 75.2 ± 5.5b | 5.25 | |
γ-Terpinene | 4000 | 54.2 ± 2.2c | 3.51 |
2000 | 62.8 ± 2.4c | 4.00 | |
1000 | 70.0 ± 3.4b | 4.67 | |
500 | 88.4 ± 3.3b | 5.78 | |
250 | 93.3 ± 6.6a | 6.00 | |
Control | 95.6 ± 4.7a | 6.69 |