The present invention is to provide a composition for preventing
plant diseases which comprises at least Component I and
Component II, is capable of obtaining a synergic effect that cannot be expected with each
single component, is capable of markedly increasing a
control effect in a much smaller amount of chemicals against various
plant pathogens, and causes no
phytotoxicity suffering.A composition for preventing
plant diseases comprises Components I and II as active ingredients. The Component I is (RS)—N-[2-(1,3-dimethylbutyl)thiophen-3-yl]-1-methyl-3-tri fluoromethyl-1H-
pyrazole-4-
carboxamide. As the
Component II, there can be exemplified, for example, tetraconazole, flutriafol, imibenconazole,
triadimefon,
simeconazole, oxpoconazole fumarate, prothioconazole,
bupirimate, spiroxamine, metiram, dodine, anilazine, chlozolinate, oxycarboxin, ethaboxam, iprovalicarb, pyrazophos, fluoroimide, diflumetorim, fenhexamid,
famoxadone,
fenamidone, cyazofamid, zoxamide, cyflufenamid, boscalid,
benthiavalicarb-
isopropyl, picoxystrobin, pyraclostrobin, fluoxastrobin or dimoxystrobin.