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Egyptian Journal of Biological Pest Control

Table 3 Toxicity values of DL3 and DL4 isolates to 4th nymphal instar of S. gregaria using leaf dipping technique

From: Phylogenic and antagonistic characteristics of novel Bacillus cereus isolates against desert locust, Schistocerca gregaria Forskal (Orthoptera: Acrididae)

Isolate

N

Slope (SE)

LC50ab

χ2 (df)c

95% FL

Toxicity indexd

DL3

180

2.44 (0.37)

73 × 106 b

3.07 (3)

55 × 106–92 × 106

2.7

DL4

180

1.9 (0.33)

2 × 106 a

3.6 (3)

1 × 106–3 × 106

100

  1. N refers to total number of insects in treatment
  2. aLC50’s reported in CFUs
  3. bLC50’s followed by the same letter are not significantly different based on overlap of their 95% Fiducial limits (P < 0.05)
  4. cL.R. chi-square goodness-of-fit values. Tabular values at P = 0.05 for 3 df = 7.81
  5. dToxicity index (Sun 1950) = (LC50 of the most efficient compound (as standard)/LC50 of the other tested compound) × 100
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