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 nützliche Insekten zur Bekämpfung der Schildlaus einzuführen ; dieser Vorschlag, der keinen 

 Anklang fand, wurde 1887 von Alexander Cr aw wiederholt, der empfahl, D. W. Co quill ett, 

 der bis dahin Versuche mit chemischen Mitteln gegen die Schildlaus durchgeführt hatte 



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