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Table 2 Percentage mortality of P. americana on exposure to J. curcas pure oil (contact toxicity)

From: Repellency and insecticidal properties of seed oil of Jatropha curcas L. against American cockroach, Periplaneta americana L.

Concentration % (v/v)

Number of death (% mortality)/time of exposure

Mean mortality ± SD

24 h (n = 40)

48 h (n = 40)

72 h (n = 40)

96 h (n = 40)

120 h (n = 40)

Oil solution

 0.30

0 (0.0)

0 (0.0)

2 (5.0)

4 (10.0)

4 (10.0)

2.00 ± 2.00d

 0.60

2 (5.0)

4 (10.0)

8 (20.0)

12 (30.0)

14 (35.0)

8.00 ± 5.10cd

 0.90

4 (10.0)

6 (15.0)

12 (30.0)

20 (50.0)

34 (85.0)

15.20 ± 12.21bcd

 1.20

8 (20.0)

14 (35.0)

34 (85.0)

40 (100.0)

40 (100.0)

27.20 ± 15.14ab

 1.50

14 (35.0)

24 (60.0)

40 (100.0)

40 (100.0)

40 (100.0)

31.60 ± 12.03a

Pure oil

 1.00

8 (20.0)

12 (30.0)

12 (30.0)

16 (40.0)

16 (40.0)

12.80 ± 3.35cd

 2.00

12 (30.0)

16 (40.0)

20 (50.0)

20 (50.0)

24 (60.0)

18.40 ± 4.56abc

Control (3 ml 20% acetone)

0 (0.0)

16 (40.0)

16 (40.0)

28 (70.0)

32 (80.0)

18.40 ± 12.52abc

  1. n = total number of cockroaches introduced in each group. Means along the same column with different alphabet(s) are significant at p ≤ 0.05