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

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 x 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 x 10^–2M, however, CuEDTA and CuSO₄ still reduced the time required to permanent wilting although each was needed in greater concentrations.

² Associate Professor of Agronomy, Farm Advisor, and Agriculturist, respectively.

Received for publication April 10, 1969.