Prof. em. Dr. W. Schwenke

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The forest insects outbreaks finally are founded on the transformating natural woods into artificial forests with destable ecological equilibrium. High temperatures in combination with dryness lead to insect outbreaks beginning with the break down of the watere-quilibrium in the trees. By this the resin- and sappressure drops allowing bark beetles to enter(More)
Studies on the contents of breeding boxes made in the pine forests of Geisenfeld in former times as well in 1982 showed a high per cent (62.5%) of singing bird settlement within boxes having an oval hole of entrance (Tab. 1). Three species of titmice (Coal-, Great- and Crested Tit) strongly predominated. They showed only small change in density between 1976(More)
In last years Dimilin showed high efficiency against free feeding larvac of Lepidoptera and Tenthredinidae injurious to forests. Arthropods sucking plant sap or living hidden at plants can not be reached by this substance. However some species of nematodes living ectoparasitic on roots are susceptible. Dimilin does'nt belong to a poison-class. It is'nt(More)
Going on with the studies from 1982 (s.Schwenke, 1983) two new types of bat boxes were tested in 1983 in addition to the three types of each of the bird-and bat-boxes applied in the year before. The controls made at the end of September and the beginning of October 1983 resulted in three points: 1. The Great Titmouse,Parus major, showed a very high density(More)
Principles of population dynamics and control of the Great Spruce Bark Beetle,Ips typographus (L.) (Col., Scolytidae) For the benefit of a better prophylaxis and control the picture of the Great Spruce Bark Beetle,Ips typographus, should be corrected in some points. Contrary to the conception guilty till nowIps typ. is a sole secondary pest which doesn't(More)
Results are given on insects catched by 30 traps baited with Pheroprax in July and August 1984 in South Tyrol. In addition to 116,000 indiv. ofIps typographus the flight barriere traps contained 12,000 indiv. of other bark beetle species and 1222 indiv. of other insects belonging to 8 orders, 57 families and 150 species. Most dominant were Coleoptera(More)
The development marked by the terms: forest protection —wood protection—wood hygiene, as to be seen in last decades is based on the advance from economic to ecologic way of thinking. It has been influenced importantly byE. Schimitschek who published a directive book entitled „Grundzüge der Waldhygiene” in 1969 based on his extensive investigations in former(More)
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