highly significantp < 0.001
In the behavioural assay, the eugenol exerted a significant repellent effect starting from the 6.0 pmol cm −3 (χ 2 = 4.800, p = 0.028), and resulting highly significant at 11.9 pmol cm −3 ( χ 2 = 13.333, p < 0.001) (Fig. 4 ).