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Mechanische und physiologische Abwehrreaktionen einiger Blattlausarten [Aphididae] gegen Schlupfwespen [Hymenoptera]

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Summary

It was known from earlier experiments thatRhopalomyzus ascalonicus (Donc.) encapsulated the eggs andRhopalosiphoninus staphyleae (Koch) ssp.tulipaellus Theob. the larvae ofAphelinus semiflavus How., but, on the other hand, the mechanical defence reactions of both aphids against the parasite appeared to be conspicuously weak. These experiments were now extended to the parasiteDiaeretiella rapae (M'Intosh) and to the aphidNeomyzus circumflexus (Buckt.).

Also the eggs ofD. rapae were encapsulated byRh. ascalonicus without any exception.

N. circumflexus only killed the larvae ofD. rapae andA. semiflavus by encapsulation, but some larvae of the second species remained alive. The defensive behaviour of this host during the approach and the attack byA. semiflavus was markedly less developped than that ofMyzus persicae (Sulz.) and was comparable to the behaviour of the two other aphid species.

Probably, the defence behaviour of the investigated aphids was reduced when after phylogenetic development of the blood reaction it had become dispensable.

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Authors and Affiliations

  1. Institut für Pflanzenkrankheiten der Universität Bonn, Bonn, Deutschland

    Hubert Wilbert

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  1. Hubert Wilbert
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Wilbert, H. Mechanische und physiologische Abwehrreaktionen einiger Blattlausarten [Aphididae] gegen Schlupfwespen [Hymenoptera]. Entomophaga 12, 127–137 (1967). https://doi.org/10.1007/BF02370609

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  • DOI: https://doi.org/10.1007/BF02370609

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