Table 3 Interaction between Tracer and entomopathogenic nematode species over mortality rate (mean ± SE) of the second and third larval instars of Spodoptera litura after 48 h of treatment application

Tracer 800 ppm

66.67 ± 6.67ab**

–

–

43.33 ± 3.34ab**

–

–

Tracer 400 ppm

40.00 ± 5.77 cd

–

–

23.33 ± 3.34bcde

–

–

Tracer 200 ppm

16.67 ± 6.67ef

–

–

6.67 ± 3.33ef

–

–

Sc 1000 IJs

13.33 ± 3.33ef

–

–

3.33 ± 3.33ef

–

–

Sc 500 IJs

3.33 ± 3.33ef

–

–

0.00 ± 0.00f

–

–

Sc 200 IJs

0.00 ± 0.00f

–

–

0.00 ± 0.00f

–

–

Sc 100 IJs

0.00 ± 0.00f

–

–

0.00 ± 0.00f

–

–

Hi 1000 IJs

16.67 ± 6.6ef

–

–

10.00 ± 5.77ef

–

–

Hi 500 IJs

6.67 ± 3.33ef

–

–

3.33 ± 3.33ef

–

–

Hi 200 IJs

3.33 ± 3.33ef

–

–

0.00 ± 0.00f

–

–

Hi 100 IJs

0.00 ± 0.00f

–

–

0.00 ± 0.00f

–

–

Sc + TR 800 ppm

80.00 ± 5.77a

39.69

Synergistic

50.00 ± 5.77a

1.31

Additive

Sc + TR 400 ppm

53.33 ± 3.33bc

20.54

Synergistic

36.67 ± 6.67abc

1.81

Additive

Sc + TR 200 ppm

43.33 ± 3.34 cd

54.92

Synergistic

16.67 ± 6.67 cdef

1.54

Additive

Hi + TR 800 ppm

76.67 ± 3.33a

7.02

Synergistic

40.00 ± 5.77ab

16.73

Synergistic

Hi + TR 400 ppm

43.33 ± 3.34 cd

12.1

Synergistic

33.33 ± 3.33abcd

1.11

Additive

Hi + TR 200 ppm

23.33 ± 6.67de

1.87

Additive

13.33 ± 8.82def

0.00

Additive

Control

0.00 ± 0.00f

–

–

0.00 ± 0.00f

–

–