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Egyptian Journal of Biological Pest Control

Table 4 Toxicity values of DL3 and DL4 isolates to 4th instar nymphs of S. gregaria using per os technique

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

Isolate

N

Slope (SE)

LC50a, b

χ2 (df)c

95% FL

Toxicity indexd

DL3

30

2.18 (0.8)

181 × 106 a

0.62 (3)

60 × 106–374 × 106

21.5

DL4

30

2.3 (0.7)

39 × 106 a

0.7 (4)

14 × 106–74 × 106

100

  1. N Refers to total number of insects in treatment
  2. aLC50’s reported in CFUs
  3. b LC50’s followed by the same letter are not significantly different based on overlap of their 95% Fiducial limits (P < 0.05)
  4. c L.R. chi-square goodness-of-fit values. Tabular values at P = 0.05for 3 df = 7.81, 4 df = 9.49
  5. dToxicity index (Sun 1950) = (LC50 of the most efficient compound (as standard)/LC50 of the other tested compound) × 100
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