highly significantP <0.001
The results of the logistic regression ( Table 3 ) analysing differences in non-aggressive versus aggressive behavioural reactions reveal a highly significant reduction of displayed aggression by Argentine ants with pheromone concentrations of 1 μg/μl (Wald = 9.921; df = 1; P <0.001) and 100 μg/μl (Wald = 12.398; df = 1; P <0.001) compared to untreated controls.