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Table 1 Efficacy of the Beauveria bassiana (Y-F_ITS1) against different larval instars of Spodoptera littoralis under laboratory conditions

From: Pathogenicity induced by indigenous Beauveria bassiana isolate in different life stages of the cotton leafworm, Spodoptera littoralis (Boisduval) (Lepidoptera: Noctuidae) under laboratory conditions

Concentrations (spores ml−1)

Larval instars

Mortality percentage

1 day

2 days

3 days

4 days

5 days

1 × 106

L2

0.0

16.0 a

50.0a

76.0a

85.0a

L3

0.0

6.0b

45.0b

63.0b

65.0b

L4

0.0

6.0b

40.0c

55.0c

63.0b

L5

0.0

0.0c

10.0d

13.0d

15.0c

1 × 107

L2

16.0

53.0a

60.0a

93.0a

95.0a

L3

0.0

33.0b

53.0b

75.0b

75.0b

L4

0.0

16.0c

50.0b

63.0c

73.0b

L5

0.0

3.0d

13.0c

18.0d

23.0c

1 × 108

L2

23.0

65.0a

83.0a

96.0a

96.0a

L3

0.0

38.0b

80.0a

86.0b

88.0b

L4

0.0

20.0c

53.0b

73.0c

75.0c

L5

0.0

5.0d

22.0c

25.0d

46.0d

1 × 109

L2

30.0

75.0a

90.0a

97.0a

99.0a

L3

0.0

43.0b

85.0b

89.0b

90.0b

L4

0.0

23.0c

60.0c

85.0c

88.0c

L5

0.0

7.0d

33.0d

40.0d

56.0d

Control

L2:5

0.0

0.0

0.0

0.0

0.0

  1. Means of the same column at the same concentration followed by different letters are significantly different (P ≤ 0.05)