Methodische Probleme des Fanges von Lymantria monacha L. (Lepid. Lymantriidae) in verschiedenen Pheromon-Lockfallen

Methodical problems of Nun moth trapping (Lepidoptera, Lymantriidae) in various pheromone-trapsVarious types of pheromone traps, which were used for catching ofLymantria monacha L., did not prove to be well suited either for checking of the occurrence of the pest and for its prognosis, or for estimating the size of the Nun moth population. Much more reliable data were obtained by using simple plates made of zinc sheet of size 50 × 50 cm or 50 × 100 cm, which were either on one or both sides covered with glue and sometimes they had an opening in the middle (10 × 10 cm) to allow spreading of the pheromone on both sides of the plate.Eight series of experiments, the results of which are given in the text, in the figures and tables, showed that the method of using pheromone traps renders new possibilities not only for prognosis and checking of the occurence of the Nun moth, but also for research on its ecology and ethology. It enables to investigate mating behavior and ecological problems even at the non-escape-phase of the pest. Further elaboration of this method in future years will make possible to derive from the data, obtained from the pheromene traps, data on the abundance of Nun moth in forest growths and on its flight distances.