Sulfur trifluoride or nitrous oxide and / or its effective salt in agriculture； for the purpose of controlling plant pathogens； a method of controlling harmful plant pathogens, including the treatment of fungi or plants, soil or seeds to prevent chemical attack, Contains at least one compound or nitrous oxide or an effective amount of a salt acceptable in agriculture； at least the agrochemical composition of such a compound； and the agrochemical composition of seeds. 1. Property 1: compound (1) with formula property,or N-oxides, or salts of those acceptable in agriculture, where: A is phenyl or thiophenyl； and wherein the cyclic groups A are unsubstituted or substituted with 1, 2, 3 or 4 identical or different RA groups； wherein RA is OH, cyclopropyl, halogen, cyano, di-C₁₋₆-alkylamino, C₁₋₆-alkyl, C₁₋₆-alkoxy, C₁₋₆-alkylthio, C₂₋₆-alkenyl, C₂₋₆-alkynyl, C₃₋₈-cycloalkyl or C₃₋₈-cycloalkoxy； and wherein any of the aliphatic or cyclic portions is unsubstituted or substituted with 1, 2, 3 or 4 identical or different Rᵃ groups； wherein Rᵃ is halogen, cyano, C₁₋₆-alkyl, C₁₋₆-haloalkyl,C₁₋₆-alkoxy or C₁₋₆-haloalkoxy； R¹,They are independent,hydrogen, C₁₋₆-alkyl, C₂₋₆-alkenyl, C₂₋₆-alkynyl, C₃₋₆-cycloalkyl, C₃₋₆-cycloalkenyl, C₁₋₄-alkoxy, -C (= O) - (C₁₋₆- I rent),-C (3DO) - (C -alcoxi)phenyl-C₁₋₄-alkyl, heteroaryl-C₁₋₄-alkyl, C₃₋₆-cycloalkyl-C₁₋₄-alkyl, phenyl, naphthyl or a saturated monocyclic or bicyclic heterocycle, partially unsaturated or aromatic of 3 to 10 members, in wherein the ring member atoms of said monocyclic or bicyclic heterocycle include, in addition to carbon atoms, 1, 2, 3 or 4 additional heteroatoms selected from N, O and S as ring member atoms, and wherein 1 or 2 member atoms of the heterocycle ring can be replaced by 1 or 2 groups independently selected from -C (= O) - and -C (= S) -；and wherein the heteroaryl-C₁₋₄-alkyl heteroaryl group is a 5 or 6 membered aromatic heterocycle, wherein the heterocyclic ring member atoms include, in addition to car
