[On the outbreak of nun moth (Lymantria monacha L.) in Scots pine stands in north east Lower Saxony. Analysis of situation in winter 1994/95 and discussion on possible actions for control]

animal population baja sajonia basse saxe control de plagas dynamique des populations forstschutz infestation insecte phyllophage insectos depredadores de las hojas leaf eating insects lower saxony lutte antiravageur lymantria monacha massenvermehrung pest control pinus sylvestris population animale population density population dynamics waldbau