This image was sent by German beekeepers of their protest outside the Bayer Corporation annual meeting April 29, 2011:

Beekeepers in Germany are deeply concerned that Bayer's pesticides, especially the nicotine-based systemic pesticides (that render the entire plant, stem, leaves, roots, nectar and pollen toxic) are a significant threat to honey bees. Those pesticides are widespread as seed-coatings on most corn sold worldwide through Bayer's partnership with Monsanto. These seeds are almost always both Genetically Modified (GMO) and coated with a systemic nicotine pesticide - and sometimes also a fungicide or  other pesticide.

These seeds thus become deeply toxic, on many levels.