A series of 17 new derivatives of 2-(2,4,5-trichlorphenoxy)propionate acid was synthetized and tested on pesticide activity. All compounds showed high activity against dicots at 5 kg a.s./ha. Eight compounds were tested in the II stage screening-test. The compounds had a good herbicidal efficacy only at higher dose (2.5 kg a.s./ha), when the dose decreased to 1,25 kg a.s./ha activity was strongly reduced.
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