A method of inducing virus tolerance of plants which comprises treating the plants, the soil or seeds with an effective amount of an amide compound of the formula (I), where Ar is a substituted phenyl, pyridyl or 5-membered heterocyclic ring； M is an optionally substituted thienyl or phenyl ring； Q is a direct bond, oxygen, sulfur, SO, SO2, C1C6-alkylene, C2-C6-alkenylene, a cyclo-propyleneor an anellated bicyclo[2.2.1]heptane ring； R1 is hydrogen, alkyl, haloalkyl, optionally substituted phenyl or optionally substituted cycloalkyl.
