Wolfgang Völkl

TL;DR: The honeydew composition and production of four aphid species feeding on Tanacetum vulgare, and mutualistic relationships with the ant Lasius niger were studied, showing consistent with the ants' preference for M. fuscoviride, which produced the largest amount of Honeydew including a considerable proportion of the trisaccharides melezitose and raffinose.

TL;DR: This review evaluates multitrophic relationships and hyperparasitoid ecology of various taxa of phytophagous and predacious insects, using the aphid-parasitesitoid-hyperparasite food web as a model system.

TL;DR: The influence of ant-attendance on patterns of parasitism was studied for two parasitoid species attacking the black bean aphid Aphis fabae, Trioxys angelicae and Lysiphlebus cardui on the host-plants Evonymus europaeus (L.) and Cirsium arvense (L).

TL;DR: It is proposed that a wasp's reproductive strategy, as opposed to hyperparasitism, is the dominant factor in aphidiid population dynamics, and that a parasitoid's potential to regulate the host population is largely determined by its foraging strategy.

TL;DR: It is shown that the majority of the male‐killing lines tested from Central and Eastern Europe do not bear amale‐killing Rickettsia bacterium, and 16S rDNA sequence analysis suggests male‐ Killing is associated with a member of the genus Spiroplasma, which is discussed in relation to the evolutionary genetics of male‐ killing bacteria, and the evolution of male-killing behaviour in the eubacteria.