abstract |
2-aryl-1,2,4-triazine-3,5 (2H, 4H) -diones and thiones similar herbicides in which W1 and W2 are oxygen on sulfur; R1 is amino, alkenyl, alkynil, alkyl or substituted alkyl; R2 is hydrogen, alkenyl, alkynil, amino, alkyl or substituted alkyl, halo, carboxyl or alkoxycarbonyl. |