Effects of Ozone on Controlling Fruit Rot Diseases of Imported Chinese Pear and Apple from China

Abstract

The effect of ozone to control Alternaria sp., Cladosporium sp. and Penicillium sp. which were isolated from fruit rot of imported chinese pear and apple from China during October 2015-January 2016. Completely Randomized Design (CRD) was employed in these studies. The mycelial growth of Alternaria sp., Cladosporium sp. and Penicillium sp. were not inhibit after exposure of ozone at 1 g/hr. for 0 (Control), 15, 30, 45 and 60 minutes. The same result was also shown when ozone gas at 1 g/hr. for 0, 15, 30, 45 and 60 min. was applied on chinese pear and apple. Whereas, application of ozonated water at 1 g/hr. for 30, 45 and 60 min., the spores germination of Alternaria sp., Cladosporium sp. and Penicillium sp after 24 h of incubation were 0.40-0.80, 0 and 0% respectively. Moreover, application of ozonated water at 1 g/hr. for 30, 45 and 60 min. also significantly inhibited fruit rot by 100% in chinese pear and apple after storage compared to the application of the ozonated water for 15 min. could inhibited fruit rot diseases only 0.52-3.31%