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The research was carried out in 2005 − 2007 in the area of the Kórnik Arboretum and covered parasitoids of the Pimplinae, Poemeniinae and Diacritinae (Hymenoptera, Ichneumonidae) subfamilies, which control a number of plantdamaging phytophages. The quality and quantity composition of the parasitoids was defined, and the characterization of Pimplinae communities was carried out on the basis of the following biocenotic indices: Shannon’s diversity index H’, Pielou’s evenness index J’ and Simpson’s diversity index d. The Pimplinae communities were compared in terms of quality using the method of the Marczewski-Steinhaus MS index. Thirty-one species of Pimplinae were found; they account for 23.3% of the national fauna and 43.0% of species reported for Wielkopolska. Three species of Poemeniinae and one species of Diacritinae were also found. Among Pimplinae the prevailing species were those which decrease the number of pests belonging to exo- and endophytophages of Micro- and Macrolepidoptera. The dominants were: Pimpla contemplator (Muelle.) − 24.9%, Pimpla flavicoxis Thoms. − 12.3%, Pimpla insignatoria (Grav.) − 9.1%, Itoplectis maculator (F.) − 6.3% and I. alternans (Grav.) − 5.9%. Poemeniinae included Poemenia brachyura Holmgr. and P. herctica (Grav.), belonging to parasitoids of xylophages. Diacritinae were represented by Diacritus aciculatus (Voll.), whose trophic links are not yet known.

This study was conducted in 2008–2010 in three apple orchards in western Poland and involved a massive catch of the red-belted clearwing moth, Synanthedon myopaeformis (Borkhausen) (Lepidoptera: Sesiidae), and its parasitoid Liotryphon crassiseta (Thomson) (Hymenoptera: Ichneumonidae) in yellow Moericke traps. The flight time for both species was correlated and fell in the first half of July. However, the correlation between the occurrences of both species was statistically significant only in 2008, when most specimens were caught. A total of 7960 S. myopaeformis were caught, with a 2:1 male:female sex ratio, and 415 adult L. crassiseta. No correlation between the numbers of S. myopaeformis and L. crassiseta in relation to age, variety of trees, or orchard surface area was noted. Significant differences between the catches of S. myopaeformis and L. crassiseta were reported in particular years. Furthermore, clear differences in the yields of S. myopaeformis and L. crassiseta between traps situated in the orchard and those on its edges were recorded, particularly in the orchard surrounded by cultivated fields. Yellow pan-traps could be used more widely in order to monitor and control the abundance of S. myopaeformis, especially by catching its females.

The impact of the vegetation of apple orchard edges on quantity and quality structure of predatory hoverflies (Diptera: Syrphidae) communities SummaryThe research on the impact of apple orchard edges vegetation on quantity and quality structure of predatory Syrphidae was carried out between 2008 and 2010 in the vicinity of Czempiń in the western part of Wielkopolska, Poland. Quality and quantity analyses of Syrphidae communities in the apple orchards and on their edges were conducted; the edges included fields, shrubberies and a road lined with trees and bushes. The total of 35 Syrphidae species were found, which constituted 8.8% of the national fauna of this family. In the orchards 24 species and on the edges 32 species were caught. The total number of specimens of the family was 5080, out of which 2338 were caught in the orchards and 2742 on the edges.. Apple orchards with developed edge vegetation yielded higher abundances of Syrphidae than the orchard bordering on the fields. All the orchards and their edges were dominated by two species, namely Episyrphus balteatus (De Geer, 1776) and Eupeodes corollae (Fabricius, 1794). It was found that the majority of Syrphidae flies communities inhabiting the orchards and their edges showed a high similarity in their quality and qualityquantity structures. The research showed that the occurrence of well-developed vegetation with diversified species on apple orchard edges positively influences the species richness and abundance of predatory Syrphidae occurring in the orchard habitat.