Methyl Bromide Gas -- as deadly as the well known carbon monoxide gas, is also colorless and odorless, preventing bees from detecting the danger. Nothing escapes it... weeds, insects, even rats. It is pumped into the soil with spray nozzle arrays behind huge tractors and completely kills bugs ( and all other life in the soil ) but amazingly-- is then just let escape out into the environment.

Methyl Bromide Gas is 3 times heavier than air. This heavier weight causes resettling at the ground level even after being blown around by wind to a distance away where honey bees are pollinating at ground level. Bees cannot see or smell the carbon monoxide-like gas to know to fly away to safety. Methyl Bromide Gas Insecticide is so effective at killing it was used in the anthrax cleanup. It is able and used to completely kill systemic termite infestations in the foundations of houses on the mere vapors alone.

Although the poisonous Methyl Bromide Gas has been classified for non use in 2005 due to the ozone depleting nature identified earlier ( 50x more ozone damage than CFC's ), a "Critical Use Exemption" (CUE), "designed for agricultural users with no 'technically or economically feasible alternatives'" is currently allowing an apparent loophole for widespread continued use:

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[link to www.epa.gov]