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A Field Study Method as a Potential Higher Tier Option to Refine Herbicide Risk Assessment for Nontarget Terrestrial Plants

Authors
  • Isemer, Rena1
  • Mihan, Christine1
  • Peeters, Stephanie2
  • Rumohr, Quintana2
  • Toschki, Andreas2
  • Ducrot, Virginie1
  • 1 Bayer AG, Crop Science Division, Monheim, Germany , (Germany)
  • 2 gaiac Research Institute for Ecosystem Analysis and Assessment, Germany , (Germany)
Type
Published Article
Journal
Integrated Environmental Assessment and Management
Publisher
Wiley (John Wiley & Sons)
Publication Date
Apr 16, 2020
Volume
16
Issue
5
Pages
691–705
Identifiers
DOI: 10.1002/ieam.4263
PMID: 32162779
PMCID: PMC7496580
Source
PubMed Central
Keywords
License
Unknown
External links

Abstract

A method for testing effects of herbicides on nontarget terrestrial plants (NTTPs) in the field based on establishing an experimental plant community via sowing of a seed mixture of noncrop plant species on a test area was developed, optimized, and evaluated. The field method was used to assess effects of the herbicide iofensulfuron‐sodium on single‐species and community‐level endpoints based on vegetation coverage, emergence, phytotoxicity, growth stage, and total plant biomass, which showed that community endpoints cover single‐species endpoints. Field study and standard NTTP single‐species greenhouse study results were compared, and endpoints in the field were higher than in the greenhouse study. Representing a higher tier option, the proposed method increases realism alongside with variability of results and is, depending on the specific protection goal, potentially suitable to inform the risk assessment and serve as a reference tier.

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