History
Modern day herbicidal warfare resulted from military research discoveries of plant growth regulators in the Second World War, and is therefore a technological advance on the scorched earth practices by armies throughout history to deprive an enemy of food and cover.
Work on military herbicides began in England in 1940, and by 1944 the United States joined in the effort. Even though herbicides are chemicals, due to their mechanism of action (growth regulators) they are often considered a means of biological warfare. Over 1,000 substances were investigated by wars end for phytotoxic properties, and the Allies envisioned using herbicides to destroy Axis crops. British planners did not believe herbicides were logistically feasible against Germany, and United States' plans for reducing Japanese rice crops for the invasion of Japan were rejected due to the similarity of the herbicide's name to the poison cyanide.
The British first used herbicides against Malaya's insurgency in 1953 by using 2,4,5-T that was intended to control rubber tree parasites. It was used to thin jungle trails to limit ambushes, and destruction of native agriculture. The denial of food was considered a decisive weapon in countering the insurgency, but was later judged to be ineffectual and contrary to other goals.
Read more about this topic: Herbicidal Warfare
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