
Diquat is a contact herbicide that produces desiccation and defoliation most often available as the dibromide, diquat dibromide. Brand names for this formulation include Aquacide, Dextrone, Preeglone, Deiquat, Detrone, Reglone, Reglon, Reglox, Tribune, Ortho-Diquat, Weedtrine-D, Weedol 2 and, in combination with glyphosate, Resolva. Diquat is a no...
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http://en.wikipedia.org/wiki/Diquat

(from the article `occupational disease`) Paraquat and diquat, the bipyridylium compounds, are deadly if ingested. Skin contact or inhalation of a concentrate of paraquat can cause fatal lung ...
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http://www.britannica.com/eb/a-z/d/53

<chemical> A contact herbicide used also to produce desiccation and defoliation. ... Pharmacological action: defoliants, chemical, herbicides. ... Chemical name: Dipyrido(1,2-a:2',1'-c)pyrazinediium, 6,7-dihydro- ... (12 Dec 1998) ...
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http://www.encyclo.co.uk/local/20973

a yellow crystalline substance, CHBrN, used as a selective postemergence herbicide to control weeds on noncrop land and for aquatic weed control.
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https://www.infoplease.com/dictionary/diquat
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