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Imidacloprid is becoming increasingly common in the United States in home insecticides sold in hardware stores for outdoor garden use.

It is also used in a liquid placed on the back of dogs to kill flees and ticks. Unlike over-the-counter flea and tick killers, it usually requires approval from a veterinarian.

Clothianidin and Imidacloprid are produced by the German company Bayer CropScience and generated $800 million in 2007, according to ENN. Imidacloprid is Bayer’s best-selling pesticide.

In August, the German Coalition against Bayer Dangers brought a charge against Werner Wenning, chairman of the Bayer Board of Management, for marketing dangerous pesticides and thereby accepting the mass death of bees all over the world, the ENN report said.