Figure 2: Intra- and interspecific gene flow of cultivated, weedy, wild sugar beet and related wild
species within and between agricultural fields and the environment (Bartsch et al., 2003, modified).
Frieder Graef et al., "Scale Implications for Environmental Risk Assessment and
Monitoring of the Cultivation of Genetically Modified
Herbicide-Resistant Sugar Beet: A Review",
Living Rev. Landscape Res., 4 (2010), 3, doi:10.12942/lrlr-2010-3, URL (accessed <date>): http://lrlr.landscapeonline.de/lrlr-2010-3.