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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)