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Effects of Ozone and negative air ions (NAI) on the in vitro development of Botrytis cinerea and Penicillum expansum moulds.

The effects of Ozone and negative air ions (NAI) on the growth rate of Botrytis cinerea and Penicillium expansum colonies, and on sporulation, have been investigated. Inoculated plates were stored in Air (control), or air with Ozone (0.5 ppm), NAI (6.1x10 6 ioni/cm 3 ) and a NAI+Ozone (6.1x10 6 ioni/cm 3 + 0.5 ppm) mixture at 7°C and 95% RH. After 48 h a reduced growth rate of the cultures stored in the presence of the fungistatic agents was observed. The reduction was greater when B cinerea and P. expansum were exposed to NAI+Ozone (30 and 83%, respectively). Ozone stopped the production of P. expansum spores and delayed spore production of B. cinerea.