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Table 3 Effect of EPN strains at three application rates on Earias vittella population, square and boll damage of cotton—Field experiment II

From: Management of cotton bollworms Helicoverpa armigera and Earias vittella by entomopathogenic nematodes

Treatments

Pre-treatment population/10 plants

Post-treatment population/10 plants (polled mean of five sprays)

Square damage /%

Boll damage /%

EPN strains at three doses

APKS2 at 1 × 109

15.0 a

8.9 c

12.3 c

8.8 dc

APKS2 at 2 × 109

15.0 a

6.5 d

9.0 de

6.4 e

APKS2 at 3 × 109

15.3 a

6.1 d

8.5 f

6.0 fe

KKMH1 at 1 × 109

15.3 a

9.5 c

13.4 c

9.7 c

KKMH1 at 2 × 109

15.0 a

6.8 d

9.5 e

6.9 e

KKMH1 at 3 × 109

15.3 a

6.4 d

9.0 ef

6.5 e

TRYH1 at 1 × 109

15.3 a

12.9 b

17.9 b

13.0 b

TRYH1 at 2 × 109

15.0 a

9.2 c

12.7 c

9.2 c

TRYH1 at 3 × 109

15.3 a

8.6 c

12.0 dc

8.7 dc

Chlorpyriphos

15.0 a

5.3 e

7.8 g

5.0 g

Control

15.3 a

17.3 a

30.1 a

20.7 a

EPN strains

APKS2

15.1 a

7.1 c

9.9 c

7.0 d

KKMH1

15.2 a

7.5 c

10.6 c

7.7 c

TRYH1

15.2 a

10.2 b

14.2 b

10.3 b

Chlorpyriphos

15.0 a

5.3 d

7.8 d

5.0 e

Control

15.3 a

17.3 a

30.1 a

20.7 a

EPN dosages

1 × 109 IJs·hm−2

15.2 a

10.4 b

14.5 b

10.5 b

2 × 109 IJs·hm−2

15.0 a

7.5 c

10.4 c

7.5 c

3 × 109 IJs·hm−2

15.3 a

7.0 c

9.8 d

7.0 c

Chlorpyriphos

15.0 a

5.3 d

7.8 g

5.0 d

Control

15.3 a

17.3 a

30.1 a

20.7 a

  1. Means followed by the same letter in columns are not significantly different at P < 0.05 (Tukey–Kramer test)
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Journal of Cotton Research

ISSN: 2523-3254

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