Table 4 Potency of the ultraviolet protectant, Tinuvin P for increasing the toxicity of three bioinsecticides against the 4th instar larvae of S. littoralis under field-laboratory conditions.

Dipel DF

10 g

84 ± 1.73^a

72 ± 2.31^a

42 ± 2.31^a

15 ± 2.31^a

3 ± 0.58^a

0.00 ± 0.00^a

–

48.21

Dipel DF + Tinuvin P

10 g + 1 g

84 ± 2.31^a

80 ± 1.16^b

72 ± 1.73^b

40 ± 2.31^b

20 ± 1.16^b

0.00 ± 0.00^a

1.37

66.06

Tracer

2.5 g

81 ± 1.16^a

66 ± 1.73^a

30 ± 1.16^c

9 ± 0.00^a

0.00 ± 0.00^a

0.00 ± 0.00^a

–

41.52

Tracer + Tinuvin P

2.5 ml + 1 g

81 ± 0.58^a

81 ± 1.73^b

72 ± 1.73^b

51 ± 1.73^c

24 ± 1.73^b

9.00 ± 0.00^b

1.71

70.98

Diacox

3 g

100 ± 0.00^b

96 ± 2.31^c

69 ± 2.89^b

30 ± 1.16^d

9 ± 0.58^c

0.00 ± 0.00^a

–

67.19

Diacox + Tinuvin P

3 g + 1 g

100 ± 0.00^b

96 ± 2.31^c

90 ± 1.73^d

78 ± 3.46^e

52 ± 2.31^d

32 ± 1.16^c

1.49

100