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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)