Kozár, F., & Konczné Benedicty, Z. 2004a Effects of the extreme cold winter in 2001/2002 on Pseudaulacaspis pentagona, and new data of distribution in Central Europe.. IOBC/WPRS Bulletin 27(5): 19-24.

Notes: In recent years Pseudaulacaspis pentagona (Targioni-Tozzetti, 1886) has become established in several new localities in Central Europe, however, in some places it has been absent in recent years. Mortality was close to 100% with great fluctuation from one part of the country to another. Mortality in winter correlated with absolute minimum temperatures of December. The absolute minimum below 20 Celsius caused very high mortality, however even winter this cold did not eliminate populations from most of the infested regions. The pheromone trap catches during the second generation reveal that this species can reestablish high density very quickly. Density has been increasing in the Budapest area since 1991.