There is growing interest in sustainable plant protection products to safeguard biodiversity. Entomopathogenic nematodes (EPNs) are promising biological control agents, that target mainly soil-dwelling insect pests and are therefore applied on soil. Recently, EPNs have also been applied as foliar treatments (Erler et al., 2022; Labaude & Griffin, 2018) to control pests that attack above-ground plant parts. However, limited ecotoxicological data is available for regulatory approval (EU Commission, 2001). This study investigates the effects of Steinernema carpocapsae on adult honey bees (Apis mellifera) and Mason bees (Osmia bicornis) and presents novel foliar and soil exposure methods for testing the risks of EPN products to bees in the laboratory.