Effect of hydrogen peroxide and peroxyacetic acid to control anthracnose disease of mango cv. Nam Dok Mai.

Abstract

The effect of hydrogen peroxide and peroxyacetic acid, single or mixed as a commercial vortexx (hydrogen peroxide / peroxyacetic acid/ acetic acid/ caprylic acid), on the growth ofColletotrichum gloeosporioides, a causal agent of anthracnose disease in ‘Nam Dok Mai’ mango was investigated. C gloeosporioides was cultured on potato dextrose agar and treated with hydrogen peroxide, peroxyacetic acid and vortexx at the concentrations of 0.1, 0.25 and 0.5%. It was found that active oxygen of all concentrations inhibited the growth of C gloeosporioides, but 0.1% hydrogen peroxide growth delayed. The mango fruits were sprayed with C.gloeosporioides and left for 24 hours before treat with peroxyacetic acid and vortexx at 0.1 and 0.25%, then stored at 25 ?C. After 6 day storage, treating the fruits with 0.25% peroxyacetic acid and vortexx was the most effective in controlling of anthracnose disease. However, they had no effect on the fruit quality such as total soluble solids, titratable acid (TA), fi rmness and percentage of weight loss. The fruits treated with 0.25% vortexx had the lowest Yellow index of the peel. Those treated with 0.25% peroxyacetic acid and vortexx after spraying with C.gloeosporioides and left for 24 hours and then kept at 8 and 13 ?C could delay disease incidence for 4 and 3 weeks respectively. However, the treated fruits kept at 8 and 13 ?C showed an increasing in TA and fi rmness and decreased the percentage of weight loss. Therefore, peroxyacetic acid or vortexx could be used for a commercial cleaning solution for mango before exporting.