1. Oxadiazos substitutes for agriculture, and methods of using these substitutes to control phytotoxin fungi； a method of controlling harmful plant pathogens, including treatment of fungi, plants, soil or seeds to protect them from chemical attack； The effective amount has at least one compound and an agrochemical composition including at least one compound. 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, or atoms that are part of the ring； a. ； (R 3) = C (R830) -；W is o or s, V is a simple direct link or a decentralized group；R² is hydrogen, C₁₋₆-alkyl, C₂₋₆-alkenyl, C₂₋₆-alkynyl, C₁₋₆-alkoxy, C₃₋₈-cycloalkyl, C₃₋₈-cycloalkenyl, C₃₋₈-cycloalkyl-C₁₋₆- alkyl, phenyl-C₁₋₄-alkyl, phenyl, formyl or N (R²ᵃ) ₂；and wherein any one of the aliphatic or cyclic groups is unsubstituted or substituted with 1, 2, 3 or up to the maximum possible amount of identical or different radicals selected from the group consisting of halogen, cyano, C₁₋₆-alkyl, C₃₋ ₈-cycloalkyl and C₁₋₆-alkoxy； and wherein R²ᵃ is independently selected from the group consisting of hydrogen, OH, C₁₋₆-alkyl, C₂₋₆-alkenyl, C₂₋₆-alkynyl, C₃₋₈-cycloalkyl, C₃₋₈-cycloalkenyl, C₁₋₆- alkoxy, C₁₋₄-alkoxy-C₁₋₄-alkyl and C₁₋₆-alkylthio； R¹ is C₁₋₆-alkyl, C₃₋₈-cycloalkyl, C₃₋₈-cycloalkenyl, C₂₋₆-alkenyl,C₂₋₆-alkynyl, C₁₋₆-alkoxyimino-C₁₋₄-alkyl, C₂₋₆-alkenyloxyimino-C₁₋₄-alkyl, C₂₋₆-alkynyloxyimino-C₁₋₄-alkyl, phenyl-C₁₋₄-alkyl, phenyl-C₁₋₄-alkenyl, phenyl-C₁₋₄-alkynyl, heteroaryl-C₁₋₄-alkyl, phenyl, naphthyl or a 3- to 10-membered saturated, partially unsaturated or aromatic mono- or bicyclic heterocycle, where the atoms Ring members of said mono- or bicyclic heterocycle include, in addition to the carbon atoms, other 1, 2, 3, or 4 heteroatoms selected from N, O, and S as
