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Table 3 Toxicity of 23 Bt isolates and the Bti-H14 reference strain against third-instar larval stage of An. gambiae 24 h post-treatment

From: Isolation and characterization of native Bacillus thuringiensis strains from Saudi Arabia with enhanced larvicidal toxicity against the mosquito vector Anopheles gambiae (s.l.)

Bt-code

Region

LC50 (μg/ml) a

LC95 (μg/ml) a

Slope ± SE

CFU/μg × 105 b

Bti-H14

–

13.3 (11.2–15.9)

63.7 (40.4–102.3)

2.4 ± 0.07

4.5 ± 0.3

Bt05

Kharj

13.4 (11.07–16.5)

78.5 (46.0–137.0)

2.15 ± 0.06

1.0 ± 0.1

Bt07

Asseer

15.0 (12.2–18.8)

90.4 (50.5–166.0)

2.12 ± 0.07

1.0 ± 0.2

Bt10

Qassim

5.0 (4.4–5.6)*

18.6 (14.6–23.8)

2.90 ± 0.06

1.2 ± 0.3

Bt11

Yanbu

12.3 (10.2–14.8)*

72.6 (43.5–124.3)

2.10 ± 0.06

0.65 ± 0.3

Bt12

Yanbu

9.5 (8.3–10.9)*

41.6 (29.4–59.6)

2.60 ± 0.06

0.53 ± 0.4

Bt16

Asser

13.0 (10.6–16.0)

84.2 (47.8–152.6)

2.02 ± 0.06

0.92 ± 0.3

Bt17

Hafr-elbaten

22.0 (18.2–26.7)

128.5 (76.4–219.7)

2.14 ± 0.06

8.1 ± 0.4

Bt26

Madinah

12.9 (9.9–16.9)

149.7 (64.7–367.2)

1.54 ± 0.05

4.1 ± 0.7

Bt27

Madinah

7.1 (6.1–8.2)*

40.1 (27.3–60.2)

2.20 ± 0.05

5.9 ± 0.4

Bt28

Makkah

8.6 (7.7–9.6)*

27.5 (22.4–33.9)

3.30 ± 0.07

6.2 ± 0.3

Bt29

Madinah

14.4 (12.4–16.7)

49.4 (34.1–72.3)

3.10 ± 0.12

0.52 ± 0.1

Bt42

Jezan

5.9 (5.2–6.8)*

24.3 (18.9–31.3)

2.70 ± 0.07

0.93 ± 0.3

Bt44

Jezan

16.1 (13.7–18.9)

91.9 (59.3–144.2)

2.20 ± 0.05

0.63 ± 0.4

Bt53

Madinah

13.8 (11.7–16.4)

101.7 (61.3–171.9)

1.90 ± 0.05

1.3 ± 0.4

Bt55

Madinah

4.1 (3.6–4.6)*

14.4 (11.6–18.1)

3.02 ± 0.07

1.95 ± 0.3

Bt56

Madinah

11.7 (10.2–13.5)*

43.8 (31.2–62.2)

2.90 ± 0.08

0.15 ± 0.3

Bt57

Madinah

7.4 (6.5–8.25)*

26.1 (20.9–32.9)

2.98 ± 0.07

1.27 ± 0.3

Bt58

Madinah

5.7 (5.1–6.5)*

24.6 (18.6–32.9)

2.60 ± 0.05

1.24 ± 0.2

Bt59

Madinah

10.3 (8.5–12.6)*

84.9 (46.3–161.6)

1.80 ± 0.05

1.28 ± 0.2

Bt60

Madinah

14.7 (12.5–17.5)

58.2 (38.1–89.9)

2.75 ± 0.10

0.13 ± 0.1

Bt63

Makkah

3.9 (3.4–4.4)*

15.7 (12.3–20.3)

2.70 ± 0.06

0.7 ± 0.2

Bt67

Madinah

6.9 (5.9–8.2)*

50.6 (31.5–83.4)

1.90 ± 0.05

0.6 ± 0.1

Bt68

Madinah

5.2 (4.5–5.8)*

21.6 (16.6–28.5)

2.64 ± 0.06

1.05 ± 0.3

  1. *Asterisks indicate significant differences compared to the reference Bti-H14
  2. aLC50 and LC95, Lethal concentration that kills 50 and 95% of larval population (n = 20), respectively (calculated by Probit analysis and reported with 95% confidence intervals)
  3. bCFU, colony forming unit (mean ± standard error). Each bioassay comprised five concentrations, one replicate for each concentration, and were repeated five times (n = 5)
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Parasites & Vectors

ISSN: 1756-3305

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