| 摘要 |
Plants are protected from the damaging effects of Phycomycetous fungi by a series of pyridazines of formula <IMAGE> wherein R3 is chloro, bromo, methyl, cyano or iodo; R is chloro, bromo, iodo, methyl, cyano or furan-2-ylmethoxy; R1 is hydrogen, methyl, ethyl or n-propyl; R2 is <IMAGE> X is fluoro, chloro, bromo or iodo; X1 and X2 independently represent X or hydrogen, provided that no more than one of X1 and X2 is hydrogen; R4 is hydrogen, chloro, bromo, methyl or ethyl; R5 is hydrogen, chloro, methyl, ethyl, chloromethyl or dichloromethyl; or R4 and R5 combine with the group to which they are attached to form a C3-C7 cycloalkyl group substituted with a R1 group; R6 is hydrogen, chloro, bromo, methyl or ethyl; R7 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.
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