Ueber die ächt waidmännifche Behanblung eines Jagdreviers

Ohne Zusammenfassung     

Rattenbekämpfung mit Hilfe eines Waldkauzes

Ohne Zusammenfassung     

Abenteuer eines mobernen Jägers auf dem Fifchotteranftand

Ohne Zusammenfassung     

Auswirkungeh einer frosfspannerbekämpfung auf die bodenfauna eines elchertwaldes

Studies were made in 1998 and 1999 In an oak forest (“Meuenburger Holz”) in Northern Germany for the purpose of testing the effect of some insecticides on the soil fauna. The preparations “Fastac” (active agent:a-Cypermeth-rin) and “Foray 48 B” (active agent:Bacillus thuringiensis var.kurstaki) were used for the control of winter moths (Operopbthera brumata). The insects and spiders were caught using the following methods: soil samples, pitfalls and net sweeps. There were differences In the spectrum of species and In the density of individuals between the three experimental areas, but these did not depend on effects of the used insecticides.     

Merkwürdige Beschädigung eines Telefonkabels durch einen Vogel

Ohne Zusammenfassung Mit 3 Abbildungen.     

I. Abhandlungen über Ernährungsftörungen eines abterbenden Cannenbeftandes

Ohne Zusammenfassung Brag, Dewib     

Zur Weiterentwicklung eines halbsynthetischen Nährmediums fürIps typographus L.

The semiartificial diet for the bark beetleIps typographus L. ofSimsek andFührer (1993) andSimsek (1995) was further developed in its handling and composition of the vitamin solution. The biological availability of the vitamins of the vitamin b-group was investigated. The diet is useful as rearing medium for larvae, pupae and adult beetles. But it is not possible by now to grow reproducibly a whole generation cycle on this diet.     

Stabilität und Wirksamkeit eines Präparates von Bacillus thuringiensis var. israelensis gegen Mückenlarven im Freiland

Zusammenfassung Die Stabilität und Wirksamkeit eines Präparats vonBacillus thuringiensis var.israelensis (Sporen und Kristalle in Pulverform) gegen Stechmücken wurde in einem kleinen Feldversuch erprobt. Das Präparat wirkte äußerst rasch und mit großer Wirkungskraft aufCulex- undAedes-Larven. Es blieb während der Dauer unseres dreimonatlichen Versuchs unter natürlichen Wetterverhältnissen (Sonnenbestrahlung, Niederschläge, max. Temp. 29°C, min. Temp. –5°C) aktiv. Ein Nachteil war jedoch das Absinken des Sporenmaterials in die unteren Wasserschichten.

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Fieldstability and efficacy of a preparation of Bacillus thuringiensis var. israelensis against mosquito larvae

SporulatedBacillus thuringiensis var.israelensis was used in powder form in a small field trial against larvaeCulex andAedes. The preparation was found to be quickly and highly active. It did not lose its activity during the three months experiment under natural climatic conditions (sunlight, rain, maximal temperature 29°C, minimal temperature –5°C). Its disadvantage was the settling of spores in the bottom layers of the water column.

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Mit 2 tabellen     

Die Stickstoffbilanz eines hochmontanen Bergwaldökosystems in den Tegernseer alpen in Abhängigkeit von der Jahreswitterung

The nitrogen budget of a montane forest ecosystem in the Bavarian Alps was investigated from summer 1993 to winter 1995/96 in dependence on seasonal weather in the project “The influence of climate change on the nitrogen budget of forest soils”. The N-budgets were calculated by the nitrogen input via throughfall and the nitrogen output by seepage water, that has been sampled using suction cups. The hypothesis of a more positiv nitrogen budget of the ecosystem in warmer summers — nitrogen input is greater than nitrogen output — could neither be confirmed nor rejected, because there were no two summers differing solely in temperature. Rather, the variable precipitation regime during the summer season predominates a potentially changed nitrogen uptake by vegetation. In the investigated ecosystem, the nitrogen budget is less positive if the precipitation is higher and/or the average temperature of the air is lower. Also, for winter periods with higher precipitation we calculated a lower rate of nitrogen accumulation or even a nitrogen loss. On the other hand, higher temperatures will cause accelerated nitrogen accumulation. This is explained by the importance of high nitrogen inputs via throughfall in winter. The sequestration of potentially mobile nitrate-N in organic matter, and thus its retention in the ecosystem, demands a certain degree of humus activity. This activity is diminished at low temperatures.