Abstract
Laboratory trials were undertaken to investigate the transmission of 2 bacterial pathogens (Serratia marcescens Bizio andBacillus thuringiensis Berliner) by the ovipositor of a braconid parasitoid,Bracon brevicornis Wesmael into the body cavity ofSesamia cretica Lederer.
The braconid's ovipositor was able to transmit the 2 bacterial pathogens and plays as inoculating needle. The host larvaeS. cretica were significantly immobilized faster by the contaminated ovipositor of a parasitoid (in case of the 2 pathogens).
After successful transmission of the bacterial pathogen into the body cavity of host larvae, different deleterious effects were significantly found for the parasitoid and its progeny specially in case ofS. marcescens.
Through contamination of the ovipositor, the non-sporeforming bacterium,S. marcescens has more pathogenic effects on the parasitoid and its progeny than the sporeforming bacterium,B. thuringiensis.
Zusammenfassung
Laborversuche mit den beiden BakterienSerratia marcescens undBacillus thuringiensis, mit denen die Legebohrer vonBracon brevicornis, als Parasitoid auf den Raupen vonSesamia cretica, kontaminiert wurden, ergaben, daß der Legebohrer als Injektionsnadel zur Einbringung der beiden Pathogene in den Wirtskörper fungiert. Die Wirtsraupen wurden durch kontaminierte Anstiche signifikant stärker immobilisiert als durch nicht-kontaminierte.
Nach erfolgter Übertragung der Pathogene in den Wirtskörper traten verschiedene nachteilige Wirkungen für den Parasitoiden auf, die beiS. marcesscens wesentlich stärker waren als beiB. thuringiensis. Letzteres Bakterium ist daher zur biologischen Bekämpfung besser geeignet als das erstere.
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Temerak, S.A. Übertragung zweler bakterieller Pathogene in den Körper von Sesamia cretica Led. (Lep., Tortricidae) mittels des Legebohrers von Bracon brevicornis Wesm. (Hym., Braconidae). Anz. Schadlingskde., Pflanzenschutz, Umweltschutz 55, 89–92 (1982). https://doi.org/10.1007/BF01907607
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DOI: https://doi.org/10.1007/BF01907607