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Schädlinge der Acacia tortilis in Tunesien
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ISBN10: 6630422309
ISBN13: 9786630422306
Publisher: Verlag Unser Wissen
Pages: 72
Weight: 0.24
Height: 0.17 Width: 6.00 Depth: 9.00
Language: German
ISBN13: 9786630422306
Publisher: Verlag Unser Wissen
Pages: 72
Weight: 0.24
Height: 0.17 Width: 6.00 Depth: 9.00
Language: German
Die Acacia tortilis subsp. raddiana, eine in der Trockenregion Tunesiens endemische Art, steht seit 1980 durch die Gründung des Nationalparks Bouhedma unter Schutz. Ihre natürliche Verjüngung wird durch den Befall ihrer Samen durch zwei Rüsselkäferarten (Coleoptera: Bruchinae) eingeschränkt: Bruchidius aurivillii und Bruchidius raddianae. Diese Arbeit hat gezeigt, dass der Befallsgrad der Samen durch diese beiden Rüsselkäfer von Jahr zu Jahr schwankt. So sank der Befallsgrad der Samen durch B. aurivillii von 2008 bis 2009 von 74,54 % auf 38,5 %, während der von B. raddianae im gleichen Zeitraum von 24,53 % auf 63,27 % anstieg. Es handelt sich zudem um zwei monovoltine Arten, deren Schlüpfen eng mit der Phänologie ihrer Wirtspflanze verbunden ist. Darüber hinaus wurden im Rahmen dieser Arbeit mehrere parasitoide Hautflügler dieser Samenkäfer identifiziert, darunter Pteromalidae, Eulophidae, Eupelmidae und Trichogrammatidae. Schlie lich wurden im Park zwei Methoden der mechanischen und chemischen Bekämpfung getestet, die sich als wirksam erwiesen haben, was neue Möglichkeiten zur Bekämpfung dieser beiden samenfressenden Schädlinge eröffnet.
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