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Analysis of an investigation to control the spruce bark beetle ips typographus l. by means of pheromones ii. summary and comparison of two locations



Analysis of an investigation to control the spruce bark beetle ips typographus l. by means of pheromones ii. summary and comparison of two locations



Zeitschrift fuer Pflanzenkrankheiten und Pflanzenschutz 93(6): 574-584



Within the scope of the tested conditions, the following biological and biometrical conclusions can be drawn from the results of the studies: Independent of the type of traps, of the intensity of beetle flight and independent of the duration of exposure, the preparations "VM" and "IVM" have good catching properties and should be developed further. In the meantime, and "IVM" preparation tested in these trials is already used to control the spruce bark beetle (Ips typographus) under the trade name Pheroprax. As far as the catching performance of tube trap and trap tree is concerned, both can be recommended for practical use. Towards the end of the observation period, the tube trap yielded slightly better results than the trap tree. The same applies with regard to the unwanted additional catches. The window trap did not turn out to be suitable in the tested form, however, it might be improved. Balanced incomplete block design (BIB) and logarithmic transformation make possible a processing of the data as test series by means of analysis of variance as well as an assessment of the individual factors (preparations, trap types, locations and observations dates) and their correlations. In future trials, a control should be included as reference magnitude, the efficiency of which is kept constant by more frequent dispensor exchanges.

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