Bedeutung der Indifferenten Arthropoden in Obstanlagen

Summary

About 50% of all Arthropods living in the crown of untreated apple trees are so called “indifferent” species, that is to say they are neither useful nor noxious to the apple tree. The most frequent and most important of these Arthropods are listed in this paper. These indifferent species however are of great importance in limiting the population density of the noxious Arthropods by interspecific competition and influencing the stability of the biocoenosis. This and also other facts point to a useful tendency of these indifferent species within the fauna of an apple tree. In any case they should not be neglected in investigations on population dynamics.