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Table 2 Effect of EPN strains at three application rates on Helicoverpa armigera population, square and boll damage of cotton—Field experiment I

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

10.2 a

6.4 e

17.1 c

12.7 d

APKS2 at 2 × 109

10.0 a

4.6 g

13.1 f

9.7 g

APKS2 at 3 × 109

10.0 a

4.3 g

11.5 h

8.0 h

KKMH1 at 1 × 109

10.0 a

7.2 c

18.4 b

13.7 c

KKMH1 at 2 × 109

10.3 a

6.8 d

13.6 e

10.4 f

KKMH1 at 3 × 109

10.3 a

5.1 f

12.3 g

9.3 g

TRYH1 at 1 × 109

10.0 a

11.3 a

21.0 a

17.0 b

TRYH1 at 2 × 109

9.7 a

9.0 b

15.4 d

12.6 d

TRYH1 at 3 × 109

10.0 a

7.3 c

14.1 e

11.4 e

Chlorpyriphos

10.0 a

3.2 h

9.7 i

7.1 i

Control

9.7 a

11.4 a

21.1 a

19.3 a

EPN strains

APKS2

10.0 a

5.1 d

13.9 d

10.1 d

KKMH1

10.2 a

6.4 c

14.8 c

11.1 c

TRYH1

9.9 a

9.3 b

16.8 b

13.7 b

Chlorpyriphos

10.0 a

3.2 e

9.7 e

7.1 e

Control

9.7 a

11.4 a

21.1 a

19.3 a

EPN dosages

1 × 109 IJs·hm−2

10.0 a

8.3 b

19.0 b

14.5 b

2 × 109 IJs·hm−2

10.0 a

6.8 c

14.0 c

10.9 c

3 × 109 IJs· hm−2

10.1 a

5.6 d

12.8 d

9.6 d

Chlorpyriphos

10.0 a

3.2 e

9.7 e

7.1 e

Control

9.7 a

11.4 a

21.1 a

19.3 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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