Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A toxic nonpersistent strong contact herbicide, C12H12N2, usually formulated as its yellow crystalline dibromide salt.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun organic chemistry A contact herbicide that produces desiccation and defoliation.

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[di– + quat(ernary).]

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Examples

  • Non-ionic spreaders: Paraquat and diquat post-emergence herbicides are unusual in that they require the use of special non-ionic spreaders in order to avoid deactivation (loss of effectiveness).

    Chapter 10 1981

  • "We've got 80 acres to do and I've going to use Reglone (diquat) instead of Roundup (glyphosate) so I can get into it quicker."

    FWi - All News 2010

  • She said she has read that diquat has been linked to cancer.

    The MetroWest Daily News Homepage RSS 2009

  • Seed crops will receive either diquat or glufosinate-ammonium instead because glyphosate can be translocated into seed and affect subsequent germination.

    FWi - All News 2009

  • Seed crops will receive either diquat or glufosinate-ammonium instead because glyphosate can be translocated into seed and affect subsequent germination.

    FWi - All News 2009

  • The plan calls for using Reward, the brand name for an herbicide with the active ingredient diquat.

    The MetroWest Daily News Homepage RSS 2009

  • Where you are using glyphosate and home-saving seed remember to leave an untreated area to go off naturally or for pre-harvest diquat.

    FWi - All News 2009

  • There is no factually established minimal toxic level or maximally allowable safe dose for diquat.

    The Daily News Tribune Homepage RSS 2009

  • Seed crops will receive either diquat or glufosinate-ammonium instead because glyphosate can be translocated into seed and affect subsequent germination.

    FWi - All News 2009

  • They should be at the forefront of the opposition to diquat use.

    The Daily News Tribune Homepage RSS 2009

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