Skip to main content
Egyptian Journal of Biological Pest Control

Table 4 Toxicity values of DL2 and DL6 isolates to 4th instar nymphs of Schistocerca gregaria using per os bioassay technique

From: Phylogenetic characteristics of novel Bacillus weihenstephanensis and Pseudomonas sp. to desert locust, Schistocerca gregaria Forskål (Orthoptera: Acrididae)

Isolate

N

Slope (SE)

LD50ab

χ2 (df)c

95% FL

Toxicity indexd

DL2

30

1.64 (0.77)

53 × 106a

0.80 (3)

68 × 102–12 × 108

49.05

DL6

30

1.64 (0.77)

26 × 106a

0.80(3)

33 × 102–59 × 106

100

  1. aLD50’s reported in cfu’s
  2. bLD50’s followed by the same letter are not significantly different based on overlap of their 95% fiducial limits (P < 0.05)
  3. cL.R. chi-square goodness-of-fit values. Tabular values at P = 0.05 for 3 df = 7.81
  4. dToxicity index (Sun, 1950) = (LC50 of the most efficient compound (as standard)/LD50 of the other tested compound) *100
  5. N refers to total number of insects in treatment
Back to article page