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Table 2 Log probit analysis of larval and pupal activity of cabbage butterfly, Pieris brassicae treated with entomopathogenic nematodes

From: Bio-efficacy of entomopathogenic nematodes, Steinernema feltiae and Heterorhabditis bacteriophora against the Cabbage butterfly (Pieris brassicae [L.]) under laboratory conditions

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**
  1. EPNs suspensions were administered at a concentration of (IJs/cm2)
  2. Lethal Concentrations are calculated by Probit Methods