摘要 |
PURPOSE: To combat bacteria and fungi with the Z-isomer of dimethomorph at a smaller dose than that of the mixture of the isomers in a short time. CONSTITUTION: This method for combating bacteria and fungi comprises treating a plant subject to or subjected to the attack of the bacteria and the fungi, the seeds of the plant, or a medium in which the plant is growing or is to be grown with the Z-isomer of dimethomorph: 4-[3-(4-chlorophenyl)-3-(3,4- dimethoxyphenyl)-acryloyl]morpholine, or with a composition containing the Z-isomer as an active ingredient and a carrier. The Z-isomer of the dimethomorph is excellent in absorption from roots and in transfer to leaves in comparison with the E-isomer, and the initial concentration of the Z-isomer in the leaves is higher by five times than that of the E-isomer. The concentration of the Z-isomer in the leaves is much higher than that in the applied solution. The Z-isomer is obtained by selectively crystallizing the Z-isomer from a solution containing the isomer mixture, isomerizing the left E-isomer to form the isomer mixture, and further repeating the above procedures. |