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Crop Science Abstract -

Modification of the Effects of 2,4-D Inhibition of Growth and Lethality in Field Beans by Copper Sulfate and Copper Ethylenediaminetetraacetic Acid1


This article in CS

  1. Vol. 9 No. 6, p. 737-738
    Received: Apr 10, 1969

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  1. R. C. Huffaker,
  2. A. V. Sarquis and
  3. M. D. Miller2



The toxicity of 2,4-dichlorophenoxyacetic acid (2,4-D) on Phaseolus vulgaris L. as modified by two copper compounds was studied. Applying CuSO4 at 10−4 and 10−3M simultaneously with a growth inhibitory concentration of 2,4-D (10−4M) reduced the inhibition significantly, allowing up to 47% greater dry weight and 44% greater trifoliolate leaf area 18 days after treatment. For maximum effect, only 1/10 as much CuSO4 (l0−3M) was required as the amount of iron compounds earlier found to be needed. CuEDTA began to affect inhibition of growth by 2,4-D at a lower concentration than did CuSO4, but at maximum effectiveness was only half as effective as CuSO4.

The time required to permanent wilting of primary leaves with 2,4-D of 6.8 ✕ 10−3M was reduced by both CuSO4 and CuEDTA at concentrations generally ranging from 10−7 to 10−3M. With an added level of l0−2M, CuSO4 did not affect the time course significantly whereas CuEDTA extended it. With 2,4-D of 1.4 ✕ 10−2M, however, CuEDTA and CuSO4 still reduced the time required to permanent wilting although each was needed in greater concentrations.

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