Definitions

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

  • n. A colorless compound, C6H3Cl3N2O2, used as a herbicide.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The herbicide 4-amino-3,5,6-trichloropicolinic acid

Etymologies

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

pic(oline) + (ch)lor(o)- + am(ine).

Examples

  • The problem you speak of with vegetable gardens is most closely associated with tomatoes which have a very low tolerance of picloram, unfortunately.

    Is it safe to eat fish especially catfish from farm ponds that hold runoff from crop fields?

  • A third compound used in the Ranch Hand herbicide formulations was picloram.

    Operation Ranch Hand

  • David informed Kissinger that all of the candidate substitutes for orange had drawbacks — 2,4-D was a suspected carcinogen and picloram was persistent and a soil sterilant.

    Operation Ranch Hand

  • Chemically, it was 80% 2,4-D and 20% picloram in a water-soluble formulation.

    Operation Ranch Hand

  • The picloram in white was somewhat more persistent because microbes did not act on it as quickly.

    Operation Ranch Hand

  • Some of the effects of picloram are to stunt leaves and cause terminal growth to stop.

    Operation Ranch Hand

  • Tests in Puerto Rico using direct applications of picloram to soil at rates four to six times greater than those employed in Vietnam had shown that only the most sensitive plant seedlings, soybeans, suffered ill effects six to twelve months later.

    Operation Ranch Hand

  • Compared to 2,4-D, picloram is much more mobile, better able to penetrate roots, and more toxic to plants.

    Operation Ranch Hand

  • One important difference between picloram and the phenoxy herbicides is that it is persistent in soils whereas the phenoxy compounds generally are not.

    Operation Ranch Hand

  • Like the phenoxy herbicides, picloram regulates plant growth, but the precise mechanisms involved are not known.

    Operation Ranch Hand

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