BIOTERRORBIBLE.COM: There is an ever expanding list of potential bio-terror agents that could be used in a bio-terror attack, but anthrax, smallpox and flu are the only “threats” the government appears worried about. These 3 agents will likely be used the same way that they were used in the U.S. government bio-terror war-games entitled Dark Winter and Atlantic Storm

Title: Agent Blue
Date: 2012
Source: Wikipedia

Agent Blue is one of the "rainbow herbicides" that is known for its use by the United States during the Vietnam War. It was sprayed on rice paddies and other crops in an attempt to deprive the Viet Cong of valuable crops. Agent Blue is a mixture of two arsenic-containing compounds, sodium cacodylate and cacodylic acid. Agent Blue is chemically unrelated to the more infamous Agent Orange and other herbicides used during the war.

As rice is incredibly durable, and difficult to destroy with conventional explosives, and does not burn, the weapon of choice was herbicides. Agent Blue affects plants by causing them to dry out. As rice is highly dependent on water to live, using Agent Blue on these paddies can destroy an entire field and leave it unsuitable for further planting.

Approximately 1.25 million US gallons (4,700 m3) of Agent Blue were used in Vietnam during the war, destroying 500,000 acres (2,000 km2) of crops.

Today, large quantities of the chemical named Agent Blue are still used on lawns and crops throughout the USA. Taken from ZNet Ecology:

"Arsenical herbicides containing cacodylic acid as an active ingredient are still used today as weed-killers. In the US they are used extensively, from golf courses to backyards. They are also sprayed on cotton fields, drying out the cotton plants before harvesting. So common -- and so profitable -- is the original commercial form of Agent Blue that it was among 10 toxic insecticides, fungicides and herbicides partially deregulated by the US Environmental Protection Agency (EPA) in February 2004. Specific limits on toxic residues in meat, milk, poultry, and eggs were removed." (Wikipedia, 2012).