A lot really has to do with chemicals being used. I came from Saskatchewan, there is (at least used to be) quite a drop in bees there. Not only that, there is a drop in song birds and the like too. Bees of course get in direct contact with the crops being sprayed, and song birds will eat the dead insects that have been killed by the chemicals. It really is a chain reaction. Just like when they finally found the main reason for the huge drop in peregrine falcons, the mercury and chemicals they had ingested caused the shells of their eggs to be very soft and then they broke when sat on and none hatched.
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