Defoliant

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A helicopter sprays defoliant on a dense jungle area in the Mekong delta (07/26/1969).

A defoliant is any chemical sprayed or dusted on plants to cause its leaves to fall off. A classic example of a highly toxic defoliant used for tactical purposes is Agent Orange, which was used widely by the U.S. military during the Vietnam War from 1961 to 1970.

Defoliants differ from herbicides in that the former seeks mainly to strip leaves from plants, and the latter is used to destroy or inhibit the growth of plants. Defoliation is not always caused by defoliants. It can be many different environmental factors that cause a plant's leaves to fall off.