The present invention relates to novel pyridazine derivatives of formula (I) as active ingredients which have microbiocidal activity, in particular fungicidal activity: wherein R
1
is hydrogen, C
1
-C
6
alkyl, C
1
-C
6
haloalkyl or C
3
-C
6
cycloalkyl; R
2
is an optionally substituted heteroaryl; R
3
is an optionally substituted heteroaryl; and R
4
is hydrogen, halogen, C
1
-C
6
alkyl, C
1
-C
6
haloalkyl, C
1
-C
6
alkoxy, C
1
-C
6
haloalkoxy, hydroxy or cyano; or an agrochemically usable salt form thereof.
本发明涉及新的
吡嗪衍
生物的公式(I)作为活性成分,具有微
生物杀灭活性,特别是杀菌活性:其中R1是氢,C1-C6烷基,C1-C6卤代烷基或C3-C6环烷基; R2是可选取代的杂环芳基; R3是可选取代的杂环芳基; 而R4是氢,卤素,C1-C6烷基,C1-C6卤代烷基,C1-C6烷氧基,C1-C6卤代烷氧基,羟基或
氰基; 或其农药可用盐形式。