Zur Parasitierung von Zikaden (Auchenorrhyncha) durch Larven der Pipunculidae (Diptera), Dryinidae (Hymenoptera) und Strepsiptera auf Getreidefeldern bei Halle (Saale)
Studies on the parasitism of leafhoppers (Auchenorrhyncha) by larvae of Pipunculidae (Diptera), Dryinidae (Hymenoptera) and Strepsiptera on grainfields around Halle (Saale). Within the framework of investigations on population dynamics of leafhoppers on different types of grains in the surrounding area of Halle (Saxony-Anhalt), 48 leafhopper species were detected. Only the species Javesella pellucida, Laodelphax striatella, Eupteryx aurata, Empoasca pteridis, Macrosteles laevis, Psammotettix alienus und Streptanus aemulans were parasitized by parasitoids. While Dryinidae and Pipunculidae were found on six and five leafhopper species respectively, Strepsiptera were only found on Javesella pellucida (parasitism rate of 20.3 %). The rate of parasitism of the six species ranged between 0.4 and 25.0%. Using the example of Psammotettix alienus (vector of the wheat dwarf virus - WDV) and Javesella pellucida, the quantitative dispersal on different types of grains and the seasonal dynamics of the parasitoids are presented. Large differences in the rate of parasitism were found both in the course of the growing season and between the 14 study areas. Furthermore the three groups of parasitoids of the leafhoppers showed different efficiencies concerning the host species as well as the season and the different study areas.