The present invention relates to novel pyridazine derivatives of formula (I) as active ingredients which have microbiocidal activity, in particular fungicidal activity: wherein R1 is methyl, ethyl or isopropyl; R2 is chloro, fluoro, hydroxy or C1-C2alkoxy; R3 is H, chloro, fluoro, methoxy or C1-C3alkyl; R4 is chloro, fluoro or bromo; and R5 is H, fluoro or methoxy; or an agrochemically usable salt form thereof; with the proviso that when R1 is methyl, R2 is chloro and R3 is H, then R4 or R5 is different from fluoro.
本发明涉及式(I)的新型
吡嗪衍
生物作为活性成分,具有微
生物杀菌活性,特别是真菌杀菌活性:其中R1为甲基,乙基或异丙基;R2为
氯,
氟,羟基或C1-C2烷氧基;R3为H,
氯,
氟,甲氧基或C1-C3烷基;R4为
氯,
氟或
溴;而R5为H,
氟或甲氧基;或其农药可用的盐形式;但当R1为甲基,R2为
氯且R3为H时,则R4或R5与
氟不同。