| abstract |
A novel herbicide is provided that has notable herbicidal activities against unwanted plants; a pyridazinone compound represented by the formula 5 (I) or its salt is further described: (see formula) wherein X is -O-, -S-, -SO-, -SO2- or -N (Y) -; Q is monocyclic aryl which may be substituted by Z, monocyclic heteroaryl which may be substituted by Z or the like; Y is a hydrogen or alkyl atom; Z is halogen, alkyl or the like; R1 is alkyl, alkenyl or the like; R2 is a hydrogen atom, alkyl or the like; R3 is halogen, hydroxy or the like; R4 is a hydrogen atom, alkyl or the like; and n is an integer from 0 to 4. |