Bacteriostatic and Bactericidal Properties of 2,4-Dichlorophenoxyacetic Acid

Abstract
Addn. of 0.02% 2,4-dichlorophenoxyacetic acid (DPAA) or its Na salt with or without 0.5% Carbowax into potato-dextrose agar had a decided retarding effect on the growth of Bacillus subtilis, Aerobacter cloacae, Staphylococcus aureus and Phytomonas tumejaciens but had no effect on Fusarium sp. and Penicillium sp. 0.08% DPAA or its Na salt in agar with or without Carbowax prevented the growth of B. subtilis, S. aureus and P. tumejaciens and retarded the growth of A. cloaceae, being toxic to this organism in 4 out of 5 cases after 1 wk. 0.08% of the acid or its salt did not affect Fusarium sp., Penicillium sp. or P. notatum.

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