Pyrimidone derivatives and their use.

摘要

There are disclosed novel pyrimidone derivatives of the formula: <CHEM> Also disclosed are a herbicidal composition containing a herbicidally effective amount of the compound (I) as an active ingredient and a method for exterminating undesired weeds by applying a herbicidally effective amount of the compound (I) to an area where the undesired weeds grow or will grow.