The present invention relates to a method for improving the health of a plant, wherein the plant, the locus where the plant is growing or is expected to grow or plant propagation material from which the plant grows is treated with an effective amount of an active ingredient, selected from the group consisting of 1-[3-chloro-2-[[1-(4-chlorophenyl)pyrazol-3-yl]oxymethyl]phenyl]-4- methyl-tetrazol-5-one (I-1), 1-[3-bromo-2-[[1-(4-chlorophenyl)pyrazol-3-yl]oxymethyl]phenyl]-4- methyl-tetrazol-5-one (I-2), 1-[2-[[1-(4-chlorophenyl)pyrazol-3-yl]oxymethyl]-3-methyl-phenyl]-4- methyl-tetrazol-5-one (I-3), 1-[2-[[1-(4-chlorophenyl)pyrazol-3-yl]oxymethyl]-3-fluoro-phenyl]-4- methyl-tetrazol-5-one (I-4), 1-[2-[[1-(2,4-dichlorophenyl)pyrazol-3-yl]oxymethyl]-3-fluoro-phenyl]- 4-methyl-tetrazol-5-one (I-5), 1-[2-[[4-(4-chlorophenyl)thiazol-2-yl]oxymethyl]-3-methyl-phenyl]- 4-methyl-tetrazol-5-one (I-6), 1-[3-chloro-2-[[4-(p-tolyl)thiazol-2-yl]oxymethyl]phenyl]-4-methyl- tetrazol-5-one (I-7), 1-[3-cyclopropyl-2-[[2-methyl-4-(1-methylpyrazol-3- yl)phenoxy]methyl]phenyl]-4-methyl-tetrazol-5-one (I-8), 1-[3-(difluoromethoxy)-2-[[2-methyl-4- (1-methylpyrazol-3-yl)phenoxy]methyl]phenyl]-4-methyl-tetrazol-5-one (I-9), 1-methyl-4-[3- methyl-2-[[2-methyl-4-(1-methylpyrazol-3-yl)phenoxy]methyl]phenyl]tetrazol-5-one (I-10) and 1- methyl-4-[3-methyl-2-[[1-[3-(trifluoromethyl)phenyl]ethylideneamino]oxymethyl]phenyl]tetrazol-5- one (I-11) and 1-[3-chloro-2-[[1-(4-chlorophenyl)pyrazol-3-yl]oxymethyl]phenyl]-4-methyl- tetrazol-5-one (I-12).La présente invention concerne un procédé qui permet daméliorer la santé dune plante, la plante, lendroit où la plante pousse ou sapprête à pousser ou un matériel de propagation de plante, à partir duquel la plante pousse, étant traité avec une quantité efficace dun principe actif, choisi parmi le groupe constitué de 1-[3-chloro-2-[[1-(4-chlorophényl)pyrazol-3-yl]oxyméthyl]phényl]-4- méthyl-tétrazol-5-one (I-1), 1-[3-bromo-2-[[1-(4-chlorophényl)pyrazol-3-yl]ox
