3. Trifluorodioxysulfonate used in agriculture and / or its available salts for controlling plant pathogens； methods for controlling harmful plant pathogens, including treatment of fungi or plants, soil or seeds to protect them from chemical attack, with an effective amount of at least one 3. Trifluoroactane sulfonic acid, or a salt acceptable in agriculture, used in the production of trifluoroacetyl oxadiazol compounds；A agricultural chemical composition, including at least one trifluorodioxy compound and an agricultural chemical composition containing seeds. 1. Property 1: compound (1) with formula property,Or a positive oxide or salt acceptable in agriculture, in which a is the heteroaromatic cycle of phenyl or 5 or 6 members, in which, in addition to carbon atoms, the atoms in the aromatic circle also include 1, 2, 3 or 4 heteroatoms selected from n, a. O and s as ring atoms, provided that the heterocycle does not contain two contiguous atoms selected from O and S； in these cases, the phenyl ring or odor aromatic cycle is not replaced or replaced by the same or different 1, 2, 3 or 4 RA groups； RA is halogen, cyanogen, c83321833183268326 tar, c83318326832683268a； e.C8321C83318D-8326Coxy o C8321C8331C8326262-Haloalcoxy；l ES-C（=O）-O-C（=S）；R1 is a saturated or partially unsaturated single periodic carbon thyroid, consisting of 3 to 8 members； in this case, the carbon thyroid ring composed of 1 to 2 atoms is replaced by an independently selected group of R1 radicals,R2,R1 3 and r1.830808；Where R1 is ± 35； = n-o-r3；R1 2 ES-35；=N-N（R830808）8322；R1 cubic meter is ± 35； - C (= n-o-r3) r83099；RS1 8308ES±35；-C（＝N-N（R83088）S8322）R83099；And indicate the positions associated with the atoms that are part of the carbohydrate ring； and in which the components of the carbohydrate ring should not be replaced or supplemented by 1, 2, 3, 4 or as many of the same or different R1 749191 radicals as possible； R1 74919 is halogen, oxo, Ciano，No.832222，Oh, SH, nh832222,a. C8324axy, c833
