Table 5 Effect of PBO on toxicity of fenitrothion in laboratory and field strains of Ommatissus lybicus under laboratory conditions.

From: Susceptibility survey of Ommatissus lybicus (de Bergevin) populations against deltamethrin and fenitrothion in Oman

Field Strain

n*

LC50**(95% CI***)

Slope (S.E)

χ2

df

P

SR****(95% CI)

RR*****(95% CI)

A’Dakhliyah

Hidhan (HN)

150

0.026 (0.019–0.034)

1.31 (0.16)

2.58

3

0.51

1.15 (0.83–1.39)ns

3.71 (3.21–4.32)+

Wadi Qari (WQ)

150

0.058 (0.041–0.079)

1.31 (0.15)

1.89

3

0.63

1.57 (1.21–2.11)+

8.29 (7.23–9.01)+

Al-Faljayn (AFn)

150

0.030 (0.023–0.038)

1.52 (0.15)

2.96

3

0.47

1.53 (1.16–1.91)+

4.29 (4.01–4.81)+

Qalat Al-Masalha (QM)

150

0.040 (0.029–0.061)

1.57 (0.15)

5.11

3

0.31

1.58 (1.19–2.04)+

5.71 (5.09–6.49)+

Al-Faghrah (AFh)

150

0.041 (0.029–0.061)

1.37 (0.17)

0.89

3

0.87

1.71 (1.09–2.67)+

5.86 (5.27–6.71)+

Al-Jailah (AJ)

150

0.029 (0.018–0.040)

1.51 (0.16)

2.58

3

0.51

1.52 (1.09–1.91)+

4.14 (3.51–4.76)+

Nafaa (NA)

150

0.018 (0.011–0.029)

1.86 (0.19)

2.68

3

0.51

1.67 (1.27–2.11)+

2.57 (2.19–2.99)+

Al-Uaina (AU)

150

0.021 (0.015–0.030)

2.77 (0.25)

4.80

3

0.10

1.38 (1.01–1.76)+

3.00 (2.51–3.55)+

Al-Elayyah (AE)

150

0.015 (0.010–0.021)

1.79 (0.19)

4.89

3

0.16

1.27 (1.01–1.61)+

2.14 (1.81–2.49)+

Al-Kharma (AK)

150

0.017 (0.010–0.026)

1.58 (0.15)

4.11

3

0.23

1.47 (1.11–1.91)+

2.14 (1.67–2.74)+

A’Sharqiyah (North)

Baa’d (BD)

150

0.048 (0.037–0.061)

1.27 (0.17)

2.18

3

0.29

1.35 (1.06–1.89)+

6.86 (6.33–7.61)+

Maqal (ML)

150

0.033 (0.024–0.043)

1.33 (0.16)

0.89

3

0.83

1.30 (1.01–1.77)+

4.71 (4.33–5.17)+

Qarr (QR)

150

0.038 (0.030–0.051)

1.31 (0.18)

3.21

3

0.19

1.34 (1.03–1.67)+

5.43 (5.01–5.99)+

Miss (MS)

150

0.035 (0.022–0.049)

1.47 (0.17)

2.19

3

0.29

1.31 (1.07–2.61)+

5.00 (4.63–5.49)+

A’Dhahira

An Nujayd (AN)

150

0.019 (0.012–0.029)

1.87 (0.19)

2.89

3

0.37

1.32 (1.02–1.69)+

2.71 (2.44–3.09)+

Al-Hajar (AH)

150

0.014 (0.009–0.020)

1.61 (0.15)

2.25

3

0.28

1.36 (1.08–1.69)+

2.00 (1.61–2.49)+

Al-Batinah North

Wadi Haibi (WH)

150

0.030 (0.021–0.040)

1.76 (0.17)

3.98

3

0.13

1.30 (1.01–1.67)+

4.51 (4.11–4.87)+

DEL-SEL

150

0.018 (0.013–0.027)

1.89 (0.19)

3.80

3

0.11

1.39 (1.04–1.81)+

2.57 (2.18–3.01)+

LAB-SUS (Ref. Strain)

150

0.007 (0.005–0.011)

1.13 (0.17)

2.79

3

0.39

1.14 (0.83–1.43)ns

1.00

  1. *n = number of test insects used in bioassay trials, **LC50 = median lethal concentration (ppm), ***CI = confidence interval, ****SR = synergism ratio, calculated by dividing LC50 value of insecticide of a field strain by the corresponding LC50 value of the same insecticide with PBO of the same field strain, *****RR = resistance ratio, calculated by dividing LC50 value of a field strain by the corresponding LC50 value of the Lab susceptible (Reference) strain, +significantly different from the Lab susceptible (Reference) strain (95% CIs of RR didn’t include 1), and ns = non-significant.
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