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Egyptian Journal of Biological Pest Control

Table 1 Median lethal concentration of Bacillus thuringiensis protein against the target insect pest species

From: Need for growing non-Bt cotton refugia to overcome Bt resistance problem in targeted larvae of the cotton bollworms, Helicoverpa armigera and Pectinophora gossypiella

Target larvae Variety LC50a (ppm)b 95% FLc Slope (± SEd) χ2e dff Pg
Pectinophora gossypiella FH-142 8.91 4.16–12.2 0.6 (± 0.21) 1.45 3 0.83
MNH-886 13.4 6.21–20.7 0.76 (± 0.49) 0.46 3 0.92
IR-3701 14.0 3.20–25.3 0.70 (± 0.43) 0.87 3 0.83
FH-Lalazar 36.4 22.04–50.7 0.65 (± 0.2) 0.39 3 0.94
Helicoverpa armigera FH-142 5.91 3.26–7.2 0.8 (± 0.41) 0.45 3 0.93
MNH-886 4.04 1.23–7.2 0.52 (± 0.22) 0.34 3 0.95
IR-3701 2.37 0.15–4.8 1.47 (± 0.17) 3.94 3 0.27
FH-Lalazar 8.26 4.18–12.35 0.5 ± (0.25) 0.08 3 0.97
  1. aMedian lethal concentration
  2. bParts per million
  3. cFiducial limit
  4. dStandard error
  5. eChi-square
  6. fDegree of freedom
  7. gProbability
  8. hTotal number of insects tested in each bioassay
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