Abstract
The herbicidal effectiveness of four diphenyl ether herbicides, nitrofen [2.4-dichloro-1- (4-nitrophenoxy) benzene], chlornitrofen [2.4.6-trichl-oro-1- (4-nitrophenoxy) benzene], bifenox [methyl 5- (2.4-dichlorophenoxy) -2-nitro-benzoate] and chlomethoxynil [2.4-dichloro-1- (3-methoxy-4-nitrophenoxy) benzene], were studied in the fields and in the greenhouse.
The pre-emergence applications of these herbicides showed higher activity than post-emergence applications. When these herbicides were applied pre-emergence, these herbicides effectively controlled annnual grasses. And when applied postemergence, these herbicides controlled broadleaved weeds except Caryophyiiaceae, Criucferae, Compositae, and Leguminosae.
Bifenox and nitrofen controlled many weeds except Caryophyllaceae. When difenox plus simazine (6-chloro-N, N' -diethyl-1.3.5 -triazine-2.4diamine), or atrazine [6-chloro-N-ethyl-N, - (1-methylethyl) -1.3.5-triazine-2. 4-diamine] were applied pre-emergence, or post-emergence, the combinations showed a broad herbicidal spectrum.
