Abstract
Wild oat (Avena fatua L.) is one of the most troublesome weeds in wheat (Triticum aestivum L.) and difficult to control because of its adaptability and competitiveness to wheat. Diclofop-methyl has been extensively used to control postemergence wild oat. The herbicidal activity of diclofop-methyl is less than the recent aryloxyphenoxypropionate herbicides. Some newly synthesized derivatives of 2-[4-(3, 5-dichloro-2-pyridyloxy)phenoxy]propionamidoxyacetic acid showed selectivity between wheat and wild oat. In these compounds, N-ethyl-2-[4-(3, 5-dichloro-2-pyridyloxy) phenoxy]propionamidoxyacetamide (23) showed higher herbicidal activity against wild oat than diclofop-methyl and a comparable selectivity between wheat and wild oat.
