The present invention relates to new dithiinopyridazinedione derivatives, to processes for preparing them, to their use for controlling unwanted microorganisms, more particularly phytopathogenic fungi, in crop protection, in the household and hygiene sector and in the protection of materials, and also to crop protection compositions comprising these dithiinopyridazinedione derivatives.本發明係有關新穎之二硫雜己環并嗒二酮衍生物,彼等之製法,及其於作物保護、家用與保健領域上及物質保護上用於控制有害微生物(詳言之為植物病原性真菌)之用途,亦有關包含彼等二硫雜己環并嗒二酮衍生物之作物保護組成物。