| 摘要 |
Insects are combatted by treating them with a pyrogenically produced, hyrophobized silicic acid. When this is done, one can, on the one hand, spray the insects with an aqueous dispersion of the pyrogenically produced, hyrophobized silicic acid. On the other hand, one can dust the insects with the pyrogenically produced, hydrophobized silicic acid in powder form.
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