Figure_1.tif (190.26 kB)
Diagram of rings drawn around a hypothetical cotton field.
figure
posted on 2013-02-20, 22:07 authored by Shannon Heuberger, Christa Ellers-Kirk, Bruce E. Tabashnik, Yves CarrièreThe first ring is 250 m from the field edge, and each subsequent ring increases in radius by 250 m. The area of non-Bt and Bt cotton was measured at each increasing scale. Light and dark gray represent non-Bt and Bt cotton, respectively, and the black rectangle represents a monitored non-Bt cotton field. For actual monitored fields, some rings overlapped those of nearby monitored fields.