Updating risk management recommendations to limit exposure of non-target Lepidoptera of conservation concern in protected habitats to Bt-maize pollen

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Article
Panel on Genetically Modified Organisms
Acknowledgements

The Panel wishes to thank the members of the Working Group on the Environmental Risk Assessment of GMOs: Salvatore Arpaia, Detlef Bartsch, Nicholas Birch, Achim Gathmann, Jozsef Kiss, Antoine Messéan, Joe Perry, Jeremy Sweet and Christoph Tebbe for the preparatory work on this scientific output, Andy Hart and EFSA staff members: Yann Devos and Sylvie Mestdagh for the support provided to this scientific output.

EFSA Journal
EFSA Journal 2015;13(7):4127 [31 pp.].
doi
10.2903/j.efsa.2015.4127
Panel members at the time of adoption
Salvatore Arpaia, Andrew Nicholas Edmund Birch, Andrew Chesson, Patrick du Jardin, Achim Gathmann, Jürgen Gropp, Lieve Herman, Hilde-Gunn Hoen-Sorteberg, Huw Jones, József Kiss, Gijs Kleter, Martinus Løvik, Antoine Messéan, Hanspeter Naegeli, Kaare Magne Nielsen, Jaroslava Ovesná, Joe Perry, Nils Rostoks and Christoph Tebbe.
Contact
Type
Opinion of the Scientific Committee/Scientific Panel
On request from
EFSA
Question Number
EFSA-Q-2015-00059
Adopted
28 May 2015
Published
1 July 2015
Affiliation
European Food Safety Authority (EFSA), Parma, Italy
Note
Abstract

Using mathematical modelling, the EFSA GMO Panel has previously quantified the risk to non-target (NT) Lepidoptera of conservation concern, potentially occurring within protected habitats, associated with the ingestion of Bt-maize pollen deposited on their host plants. To reduce the estimated larval mortality to a negligible level, an isolation distance of 20 and 30 m was recommended between protected habitats and the nearest fields of maize MON 810/Bt11 and 1507, respectively. Here, the EFSA GMO Panel refines its model predictions, accounting for newly reported information on maize pollen deposition over long distances. For its calculations, the EFSA GMO Panel considered three exposure scenarios at a range of isolation distances, at two protection levels and for a range of lepidopteran species, including hypothetical ones, with a wide spectrum of sensitivities to Bt toxins. An analysis of various sources of uncertainties affecting the exposure of NT Lepidoptera to Bt-maize pollen was conducted, in order to provide quantitative estimates of realistic exposure levels. The EFSA GMO Panel therefore provides risk managers with a tool to estimate and mitigate the risk for NT Lepidoptera of conservation concern. In contrast to its previous outcomes obtained for unrealistically large levels of exposure that would not be expected in practice, the EFSA GMO Panel reports here mortality estimates for a more realistic level of exposure. The EFSA GMO Panel concludes that its previous recommendation for a 20 m isolation distance around protected habitats, within which maize MON810/Bt11 should not be cultivated, remains valid. New calculations show that the previously recommended isolation distance of 30 m from the nearest maize 1507 field would still protect NT Lepidoptera with known levels of sensitivity, including the ‘highly-sensitive’ Plutella xylostella. Should hypothetical species with greater sensitivities exist, larger isolation distances would be needed to ensure the desired level of protection.

Keywords
Bt-maize, environmental safety, Lepidoptera, mathematical model, non-target organisms
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Number of Pages
31