Überwachung der Nonne,Lymantria monacha L. (Lepidoptera,Lymantriidae) in den Walliser Alpen mit Hilfe von Disparlure

Results of experiments covering a period of 3 years and using 27 traps in 1974 and 51 traps in 1975–76 on 8 sites situated at an altitude of 1,100 to 1,500 m a.s.l. are presented. During this period the following amount of males were captured: 813 in 1974, 1,524 in 1975 and 1,474 in 1976. From the gathered data it is concluded that even the very low population density during the time of latency shows variations from one site to the other, as well as fluctuations.