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Notes: A relationship between degree-days and pheromone trap catches for the male of Pseudaulacaspis pentagona has been discovered and statistically analysed. In each of the two annual flights of the males of this pest this relationship is statistically significant. Moreover, a verification of this relationship has been carried out with independent data. The non-parametric Kolmogorov-Smirnov test shows that data collected and those forecast agree very well.