The aim of the study was to assess the influence of various concentrations (0%; 0.1%; 0.3%; 0.5%; 1%) of acetamiprid (Mospilan 20 SP) and chlorpyrifos (Dursban 450 EC) on the biological activity of entomopathogenic nematodes (Steinernema feltiae Filipjev – Steinernema‑System, Biopartner; Heterorhabditis bacteriophora Poinar – B-Green, Biopartner). After a 4-day contact of the nematodes with insecticides, their mortality, infectious ability and fertility was tested. Steinernema feltiae was more sensitive to used doses of plant protection products than H. bacteriophora. Both species were more susceptible to chlorpyrifos than acetamiprid. As the pesticides concentration increased, the mortality of the nematodes increased, whereas their infectious ability and fertility reduced.

Celem przeprowadzonych badań była ocena wpływu różnych stężeń (0%; 0,1%; 0,3%; 0,5%; 1%) acetamiprydu (Mospilan 20 SP) oraz chloropiryfosu (Dursban 450 EC) na aktywność biologiczną nicieni owadobójczych Steinernema feltiae Filipjev – Steinernema‑System, Biopartner; Heterorhabditis bacteriophora Poinar – B-Green, Biopartner. Po czterodniowym kontakcie nicieni z insektycydami zbadano ich śmiertelność, zdolności infekcyjne oraz płodność. Steinernema feltiae wykazywał większą wrażliwość na testowane dawki środków ochrony roślin niż H. bacteriophora. Oba gatunki były bardziej podatne na działanie chloropiryfosu niż acetamiprydu. Wraz ze wzrostem stężenia badanych preparatów śmiertelność nicieni proporcjonalnie wzrastała, a zdolności infekcyjne i reprodukcyjne malały.

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