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The studies were carried out on the maize crops grown in monoculture in 2004-2005 on two experimental fields at Łosiów and Wronów in the Opole region, Poland. Larvae of these four hoverfly species: Sphaerophoria scripta (L.), S. rueppelli (Wied.), S. menthastri (L.) and Episyrphus balteatus (Deg.) were found on maize plants. S. scripta was more abundant at both sites in 2004, whereas S. rueppelli...
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