Die Nützlingsschonende Schädlingsbekämpfung und ihre Beziehung zur Taxonomie der Nützlinge und Schädlinge

Summary

The author being in charge of the international study group for integrated control of the International Committee for Biological Control (C.I.L.B.) was invited to read a lecture on the subject mentioned above at the international meeting of the study group for taxonomy of the C.I.L.B. at Zürich.

First the factors that gave rise to an increased interest for the integrated control in W. Europe are dealth with. Next the differences in the occurence of noxious insects and spidermites in neglected and well kept orchards in the Netherlands are discussed in connection with their original causes (culture measures, chemical control, manuring). The question if every well kept plantation will be permanently threatened by specific pests is broached.

According to the author chemical control will not give a lasting solution of the problem of pest control (disturbance of the biocoenosis, development of resistant populations of the noxious organisms) nor does biological control in the temperate regions. In some cases however the integrated pest control appears to give promising results in this respect.

The possibilities of integrated control in the Netherlands and the fundamental problems connected with it are studied by a group of researchworkers.

For these investigations a reliable identification of the harmful and useful organisms is of primary importance as well as a thorough knowledge of the excisting in terrelations in the biocoenosis of the biotop in which the harmful organism is living. In this field however many taxonomic difficulties are met with. Some of these problems met by the dutch researchworkers in connection with the identification of harmful and useful organisms are dealt with.