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This article in AJ

  1. Vol. 59 No. 2, p. 194-196
    Received: Oct 10, 1966

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Indicator Plant Aberrations at Threshold Soil Herbicide Levels1

  1. J. Q. Lynd,
  2. Charles Rieck,
  3. Don Barnes,
  4. Don Murray and
  5. Paul W. Santelmann2



Plant symptoms indicating threshold soil herbicide levels on a Typic Quarzipsamment, Eufaula fine sand, are described and illustrated for five long-residue phytotoxic compounds from three chemical families: the substituted ureas, the triazines, and the pyridines. Cucumis sativa developed marginal chlorosis with 1 ppmw fluometuron (3 (m-trifluoromethylpheny1)-1,l-dimethylurea); palmate veinal chlorotic pattern with 1 ppmw prometryne (2-methylmercapto-4,6- bis (isopropylamino)-1,3,5-triazine); auxin-type manifestations of meristematic tissues with 0.01 ppmw picloram (4-amino-3,5,6-uichloro-picolinic acid); and an interveinal chlorotic pattern with 1 ppmw pyriclor (2,3,5-trichloro-4-pyridinol). Robinia pseudoacacia developed severe leaf curling and stem twisting with tendril type appearance and restricted club-like root system at 1 ppmw N-serve (2-chloro-6-(trichloromethyl) pyridine).

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