Leafcutter bee Megachile rotundata semi-field test design

Affiliation
Eurofins Agroscience Services Ecotox GmbH, Eutinger Str. 24, 75223 Niefern-Öschelbronn, Germany
Fricke, Julian;
Affiliation
Trialcamp SLU, Avda. Antic Regne de Valencia 25, 46290 Alcasser, Spain
Rodrigo, Ignacio Gimeno;
Affiliation
Eurofins Agroscience Services Ecotox GmbH, Eutinger Str. 24, 75223 Niefern-Öschelbronn, Germany
Klein, Olaf

With the 2014 published draft guidance document for higher Tier II risk assessment of pollinators, non-Apis bees came into regulatory focus. A semi-field test design with the red mason bee Osmia bicornis L. was ringtested by the ICPPR non-Apis working group in 2016 and 2017 and presented and published with a recommendation for a semi-field test design in 2021 (Franke et al 2021). So far, only a few bee species other than honey bees are in the focus for risk assessment studies worldwide, but only little is known about the toxicity of Plant Protection Products (PPPs) for other solitary bee species. Non-Apis bees comprise a wide range of body sizes as well as biological and life history traits which may result in differences in sensitivity and exposure routes in comparison to honey bees. In the EFSA Bee GD it was advised to consider not only honey bees, but also solitary bees in the plant protection product risk assessment. With the knowledge on differences in exposure pathways and life-history traits between the two managed solitary bee species Osmia bicornis and the alfalfa leafcutter bee Megachile rotundata F. (Sgolastra et al 2019), it is expected that the same PPPs will impact those species differently. In addition, a higher sensitivity of Megachile species to selected PPPs due to a lower detoxification ability was estimated (Hayward et al 2019). The main objective of the test was the methodological development of a standardised Tier II study semi-field test design based on the recommended concept for O. bicornis and to include scenarios for other potential routes of exposure for non-Apis bees towards PPPs to account for these data gaps and uncertainties in a regulatory context and to provide further solutions for the reliability of risk assessment for solitary bees.

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