A study was conducted in 2003–2005 on a plantation of shrub willow grown as energy crop. An assemblage of predatory and parasitic insects dwelling on the plantation was diverse and abundant compared to other assemblages of this type on other agricultural crops. It comprised mainly the soldier beetles, Cantharidae, and hoverflies, Syrphidae, with the eudominant species such as Cantharis fusca L. and the marmalade hoverfly Syrphus (Episyrphus) balteatus Deg., as well as the common flower bug Anthocoris nemorum L., the lacewing fly Chrysopa vulgaris or a braconid wasp Apanteles glomeratus. These species are clearly an important element in the defence mechanism of the environment against phytofagous insect species whose foraging behaviour is connected with the willow. By comparing the determined number of taxa found in the willow plantation with the data given in references on assemblages of useful fauna in similar habitats like field tree groups, the latter can be seen as more favourable.
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