1980 Volume 25 Issue 3 Pages 179-184
During the course of our investigation to discover new herbicides among amino acid related compounds, we have found that N-(3, 4-dichlorophenylcarbamoyl)-N-methyl β-alanine methyl ester (MCMD) and 3-(3, 4-dichlorophenyl)-1-methyl dihydrouracil (DCMD) showed relatively strong post-emergence herbicidal activity against broadleaf plants but did not showed any injury to wheat. In the present paper, post-emergence activity of DCMD was compared with that of MCMD, and it was found that DCMD had a higher selectivity between broadleaf weeds and wheat than MCMD. Herbicidal properties of DCMD examined were as follows:
(1) As a result of foliar application, gramineous plants, Galium spurium L., Artemisia vulgaris L. and Rumex acetosella L. were resistant. Erigeron philadelphicus L., Hemistepta lyrata Bunge, Cardamine flexuosa With. and Veronica arvensis L., which are winter annual weeds, were susceptible.
(2) From a result of soil treatment, injury of wheat was not observed even at higher dosage (80g/a). In the Petri dish test, susceptible difference between wheat and radish at germinating stage was not recognized.
(3) The persistence (half life period) in the upland soil (black volcanic ash soil) was about 1/3 period compared with that of diuron. Compared with the downward movement of diuron (1cm) in the upland soil, that of DCMD (above 4cm) was considerably large.
