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


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doi:10.2135/cropsci1969.0011183X000900060018x

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

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

Abstract

Abstract

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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