| abstract |
Pyridazine derivatives. The present invention relates to novel pyridazine derivatives of formula I, as active ingredients, which have microbiological activity, in particular fungicidal activity: wherein R4 is hydrogen, C1-C6 alkyl, C4 Haloalkyl or C 3-6 cycloalkyl; R2 is an optionally substituted heteroaryl; R3 is an optionally substituted heteroaryl; and R4 is hydrogen, halogen, C1-C6-alkyl, C1-C6-haloalkyl, C1-C6-alkoxy, C1-C6. 6-haloalkoxy, hydroxy or cyano; or an agrochemically usable salt form thereof. |