What is causal agent?

Some articles on causal agent, agents:

Newcastle Disease - Causal Agent - Use As A Biological Weapon
... Newcastle disease was one of more than a dozen agents the United States researched as potential biological weapons before the nation suspended its biological weapons program ...
Trichoderma - Causal Agent of Disease
... harzianum biotype 4) is the causal agent of green mold, a disease of cultivated button mushrooms ... Trichoderma viride is the causal agent of green mold rot of onion ...

Famous quotes containing the words agent and/or causal:

    The average American is a good sport, plays by the rules. But this war is no game. And no secret agent is a hero or a good sport—that is, no living agent.
    John Monks, Jr., U.S. screenwriter, Sy Bartlett, and Henry Hathaway. Robert Sharkey (James Cagney)

    There is the illusion of time, which is very deep; who has disposed of it? Mor come to the conviction that what seems the succession of thought is only the distribution of wholes into causal series.
    Ralph Waldo Emerson (1803–1882)