Table 2 Log probit analysis of larval and pupal activity of cabbage butterfly, Pieris brassicae treated with entomopathogenic nematodes
Nematode species | Stages | Exposure time (hrs) | LC50 (IJs/cm2) 95% LCl-UCL | LC90 (IJs/cm2) 95% LCl-UCL | Intercept | Slope ± SE | χ2 value | P value |
|---|---|---|---|---|---|---|---|---|
2nd instar larvae | 48 | 46.96 (22.88–82.03) | 69.06 (39.53–88.92) | − 1.25 | 1.3 ± 0.22 | 0.57 | 0.005** | |
Steinernema feltiae | 72 | 23.02 (14.74–35.12) | 51.62 (33.06–80.10) | − 1.21 | 1.5 ± 0.22 | 1.54 | 0.006** | |
4th instar larvae | 48 | 35.47 (23.60–53.32) | 79.91 (49.98–94.25) | − 1.50 | 01 ± 0.23 | 0.16 | 0.003** | |
72 | 22.02 (14.94–32.46) | 59.58 (40.42–87.82) | − 1.37 | 1.3 ± 0.23 | 0.11 | 0.004** | ||
Pupae | 48 | 36.18 (23.28–56.24) | 80.22 (51.61–97.08) | − 1.49 | 1.5 ± 0.22 | 0.99 | 0.003** | |
72 | 20.86 (13.76–29.93) | 73.54 (48.51–94.49) | − 1.28 | 01 ± 0.23 | 4.92 | 0.005** | ||
2nd instar larvae | 48 | 39.94 (25.15–63.44) | 75.72 (47.67–89.12) | − 1.46 | 1.5 ± 0.22 | 0.47 | 0.003** | |
72 | 20.38 (13.36–31.08) | 48.82 (32.01–74.46) | − 1.29 | 02 ± 0.23 | 2.87 | 0.005** | ||
Heterorhabditis bacteriophora | 4th instar larvae | 48 | 29.66 (18.16–48.44) | 78.70 (48.19–97.92) | − 0.83 | 1.5 ± 0.23 | 1.15 | 0.024* |
72 | 22.11 (14.10–34.67) | 49.84 (31.78–78.16) | − 0.76 | 01 ± 0.26 | 1.25 | 0.046* | ||
Pupae | 48 | 32.99 (20.63–56.76) | 73.12 (45.72–95.20) | − 1.27 | 1.5 ± 0.22 | 0.40 | 0.005** | |
72 | 21.69 (14.46–32.52) | 55.26 (36.85–82.86) | − 1.24 | 1.5 ± 0.23 | 0.83 | 0.006** |