The present invention relates to novel pyridazine derivatives of formula (I) as active ingredients which have microbiocidal activity, in particular fungicidal activity: formula (I) wherein R
1
is C
1
-C
6
alkyl, C
1
-C
6
haloalkyl or C
3
-C
6
cycloalkyl; R
2
is hydrogen or an optionally substituted alkyl, aryl or heteroaryl; R
3
is hydrogen, C
1
-C
6
alkyl or C
1
-C
6
haloalkyl; R
4
is hydrogen, C
1
-C
6
alkyl or C
1
-C
6
haloalkyl; or R
3
and R
4
together can be part of a carbocyclic or heterocyclic 3- to 8-membered ring; R
5
is optionally substituted aryl or heteroaryl; and R
6
is hydroxy, halogen, C
1
-C
6
alkoxy, C
1
-C
6
haloalkoxy, C
1
-C
6
alkylthio or C
1
-C
6
haloalkylthio; or an agrochemically usable salt form thereof.
本发明涉及式(I)的新型
吡嗪衍
生物作为活性成分,其具有微
生物杀灭活性,特别是真菌杀灭活性:式(I)其中R1是C1-C6烷基,C1-C6卤代烷基或C3-C6环烷基;R2是氢或可选择取代的烷基,芳基或杂环芳基;R3是氢,C1-C6烷基或C1-C6卤代烷基;R4是氢,C1-C6烷基或C1-C6卤代烷基;或R3和R4可以一起成为碳环或杂环3-至8-成员环的一部分;R5是可选择取代的芳基或杂环芳基;R6是羟基,卤素,C1-C6烷氧基,C1-C6卤代烷氧基,C1-C6烷基
硫醚或C1-C6卤代烷基
硫醚;或其农药可用盐形式。