Steve and others: to interpret this study, we'd need more detail about field
size, wind direction, no. of years and sites of testing, etc. Experimental
design has a large effect on the distance pollen travels, with the longest
travel distances occurring from commercial scale fields - much longer than
from research plots. I know Jemison well and he is a solid and respected
researcher, so the scale issue may have been encompassed in his study. But we
need to know these details in order to appreciate what he found.
Another related issue has been noted by a friend who is a pollination
biologist. His concern is when Bt is inserted into trees, to control spruce
budworm and other pests. He says that he volume of pollen - and the travel
distances of that pollen - will dwarf what is currently happening with corn.
This is not to discount the corn pollination issue (and by, the way, other
studies show rather wider risk intervals, although this is very much a
crop-specific issue), but to put it into a broader perspective of concern
about where this industry is going. Ann
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