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Table 2 Preference indices (β and C) evaluated from different aphid proportions (Acraccivora: L. erysimi) exposed to M. sexmaculatus in cafeteria experiment

From: Host plant-mediated prey preference and consumption by an aphidophagous ladybird, Menochilus sexmaculatus (Fabricius) (Coleoptera: Coccinellidae)

Predator Aphid ratio β index t value C index t value
Adult male
M. sexmaculatus
50:100 0.700 ± 0.06 t = 5.54;
P < 0.01
1.851 ± 0.39 t = 7.16;
P < 0.01
75:75 0.783 ± 0.05 t = 5.58;
P < 0.01
1.515 ± 0.25 t = 6.03;
P < 0.01
100:50 0.716 ± 0.06 t = 6.25;
P < 0.01
1.967 ± 0.78 t = 8.25;
P < 0.01
Adult female
M. sexmaculatus
50:100 0.670 ± 0.06 t = 2.14;
P < 0.05
1.539 ± 0.33 t = 2.62;
P < 0.05
75:75 0.615 ± 0.04 t = 2.84;
P < 0.05
1.596 ± 0.20 t = 2.89
P < 0.05
100:50 0.565 ± 0.03 t = 2.41;
P < 0.05
1.498 ± 0.22 t = 2.54;
P < 0.05
  1. Ladybird prefers A. craccivora if β is close to 1 and L. erysimi if β is close to 0. Similarly, A. craccivora is preferred if the C index is more than 1 and L. erysimi is preferred if the C index is less than 1