defoliant

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defoliant

a chemical used to remove the leaves from plants to facilitate mechanical harvesting. The early defoliants, especially arsenical compounds, presented serious hazards if the plants were later fed to livestock or if the spray drifted to nearby pasture paddocks. Modern defoliants are nontoxic if used according to manufacturer's recommendations. See mcpa, tributyl triphosphorotrithioite, thidiazuron.
References in periodicals archive ?
Farmers rely on natural processes such as seasonal freezes, rather than the application of chemical defoliants, to prompt the opening of the cotton boll and allow the cotton bud to be picked by hand or machine.
humanitarian assistance to help the country deal with on the consequences of the Vietnam War, including the lingering effects of the toxic, chemical defoliants used by U.
The police force sprays fields with chemical defoliants in conjunction with DynCorp, and conducts helicopter raids on drug laboratories -- mostly carried out in aging Vietnam-era A1-H1 "Hueys.
with which it reestablished diplomatic ties in 1995, to help address the lingering consequences of war, including unexploded ordnance and exposure to chemical defoliants.

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