Effects of the insecticide chlorantraniliprole applied at different rates (60 and 120 g a.s./ha) and each with two spray applications per treatments (1st application before flowering and 2nd application during flowering and during daily honey bee flight) were investigated under semi-field conditions following the OECD Guidance Document No. 75 (2007) and partial integration of recommendations by EFSA (2013). The test comprised 4 replicate Phaselia tanacetifolia tunnels (5 m x 20 m) in each treatment group (2 chlorantraniliprole treatment groups, control, toxic reference) for biological assessments, and additionally one tunnel for pollen and nectar residue analysis in the 2 chlorantraniliprole treatment groups and control. The potential for effects of chlorantraniliprole was evaluated regarding detailed observations of brood stages (eggs, young and old larvae), mortality, flight intensity, conditions of the colony and development of brood, behavior and residues in pollen and nectar. Challenges with the test method and testing and use of the data for the risk assessment will be discussed. Chlorantraniliprole caused no effect on the development of the marked eggs, young and old larvae (brood termination rate) while in the toxic reference group clear negative effects on all three brood stages were detected. Residues of chlorantraniliprole detected in pollen and nectar confirmed exposure of the honey bees while no residues contamination was found in the control samples. Overall, spray application of chlorantraniliprole at 60 or 120 g a.s./ha before and during flowering and during bee flight caused no biologically relevant effect on honey bee colonies.

Semi-field testing to address the risk of the insecticide chlorantraniliprole on the brood of the honey bee (Apis mellifera, Hymenoptera, Apidae)

2019 Fall National Meeting

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