Abstract

We studied the antifungal activity of the titanium dioxide (TiO₂) photocatalytic reaction, which shows antibacterial effects under UVA (315 - 400 nm) irradiation, against Botryotinia fuckeliana. Under the UVA irradiation of 1.0 mW/cm, growth of B. fuckeliana treated with TiO₂ solution was inhibited 55% more than that treated with sterile distilled water (SDW). Its effectiveness was almost same as chlorothalonil, a commercial fungicide. Furthermore, even TiO₂ solution at lower concentration showed antifungal activity by TiO₂ photocatalytic reaction under UVA irradiation, since growth of B. fuckeliana treated with TiO₂ solution at 8.5 × 10^-2 mg/l was significantly decreased compared to that treated with SDW. These results suggested that the TiO₂ photocatalytic reaction might be available as a novel fungicide against phytopathogens generated before harvesting such as B. fuckeliana.

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