| abstract |
Plants are protected from the damaging effects of Phycomycetous fungi by a series of pyridazines having halo-branched-alkyl or halo-branched-alkyl-silyl groups. The pyridazines have the formulan whereinn R 3 is chloro, bromo, methyl, cyano or iodo; R is chloro, bromo, iodo, methyl, cyano or furan-2- rlmethoxy; R' is hydrogen, methyl, ethyl or n-propyl; R 2 isn n X is fluoro, chloro, bromo or iodo; X' and X 2 independently represent X or hydrogen, provided that no more than one of X 1 and X 2 is hydrogen; , R 4 is hydrogen, chloro, bromo, methyl or ethyl; R 5 is hydrogen, chloro, methyl, ethyl, chloromethyl or dichloromethyl; norn R 4 and R 5 combine with the group to which they are attached to form a C 3 -C 7 cycloalkyl group substituted with a R 1 group; R 6 is hydrogen, chloro, bromo, methyl or ethyl; R 7 is hydrogen, methyl, ethyl, chloromethyl or dichloromethyl; one of m and n is 0 or 1, and the other is 0; p is 0-4. |