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Wirkungsweise amorpher Diatomeenerden auf vorratsschädliche Insekten. Untersuchung der abrasiven sowie sorptiven Effekte

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Abstract

The present study examined the morphological and physiological effects of amorphous diatomaceous earth against the stored product pestsS. granarius, T. molitor andT. confusum. Diatomaceous earth, namely Fossil Shield® and Dryacide® increased the mortality rate of this insects. After contact with Fossil Shield® the individuals ofS. granarius had significant lost of weight and reduced their water content respectively. This showed that silica dusts break the water barrier of the cuticle. However, it increases the transpiration rate of water across the cuticle and the insect died past several times through dehydration. As well, an addition of food affected the effectiveness of dusts against insects. A lot of stored product beetles will be able to produce metabolic water of feed substrates. This ability protects and weaves contrary to the loss of water. Diatomaceous earth’s can be effective primarily through the sorptive properties of the hygroscopic particles. One day after dust treatment a significant weight loss ofT. molitor pupae was recorded. The exposure to the silica dust Fossil Shield® caused partly an incomplete metamorphosis and death of the individuals. Pupae dipped in Fossil Shield® or abrasive aluminium dust and rolled for further five minutes, reduced not significant higher their weight as unrolled exuvial stages. The morphological analyses of treated insects under the Scanning Electron Microscope showed, that the dust covered the hole integument. Partly, the silica particles sunk into the cuticle. After application of Fossil Shield® at the cuticle of adults,T. molitor, did not show any wax layer. Also it could not be found once blocked by stigma of the mealworm. The dust particles accumulated around the respiration openings and they partly overgrew.

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Authors and Affiliations

  1. Institut für Vorratsschutz der Biologischen Bundesanstalt für Land- und Forstwirtschaft, Berlin

    Inga Mewis & Ch. Ulrichs

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  1. Inga Mewis
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  2. Ch. Ulrichs
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Mewis, I., Ulrichs, C. Wirkungsweise amorpher Diatomeenerden auf vorratsschädliche Insekten. Untersuchung der abrasiven sowie sorptiven Effekte. Anz. Schadlingskde., Pflanzenschutz, Umweltschutz 72, 113–121 (1999). https://doi.org/10.1007/BF02770707

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