| abstract |
The present invention relates to novel pyridazine derivatives of formula (I) or agrochemically useful salt forms thereof, as active ingredients having microbiocidal activity, in particular fungicidal activity.n n n Formula In n n n n n n n In Formula I above,n n n R 1 is hydrogen, C 1 -C 6 alkyl, C 1 -C 6 haloalkyl or C 3 -C 6 cycloalkyl;n n n R 2 is halogen, nitro, cyano, C 1 -C 4 alkyl, C 1 -C 4 haloalkyl, C 1 -C 4 alkoxy, C 1 -C 4 haloalkoxy, C 1 -C 4 alkylthio or C 1 -C 4 haloalkylthio;n n n R 3 is optionally substituted aryl;n n n R 4 is fluoro, cyano, C 1 -C 6 haloalkyl, C 3 -C 6 cycloalkyl, C 1 -C 6 haloalkoxy, C 1 -C 6 alkylthio or C 1 -C 6 haloalkylthio ;n n n n is an integer of 1-4. |