| abstract |
The invention relates to substituted 4,5-dimethoxyovridazones of the formula in which R ', R 2 and R 3 each independently represent hydrogen, halogen, nitro, cyano, carboxyl, alkyl, haloalkyl, alkoxy, haloalkoxy, alkylmercapto, haloalkylmercapto, alkysulfinyl- or alkylsulfonyl and n has the value 0, 1 or 2 , Process for their preparation and their use for controlling undesirable plant growth. |