Abstract:

The aim of this study was to investigate the effects and mechanism of chitosan, SiOx and their combination on
postharvest disease control of navel orange. After harvest, navel oranges were dipped into different solutions containing
either or both of chitosan and SiOx for 1 min. The influences of chitosan and SiOx treatments on natural incidence of diseases
of navel oranges were detected. Besides, the effects of chitosan and SiOx treatments on diseases control by changing the
order of inoculating pathogens were also investigated. The results showed that 1.5 g/100 mL chitosan combined with
0.08 g/100 mL SiOx exerted the most significant inhibition on natural diseases incidence, decreased the diseases incidence
and reduced the lesion diameter of navel oranges inoculated with pathogens. Compared with either treatment alone, the
combined treatment with chitosan and SiOx was more effective.

Key words: chitosan, SiOx, navel orange, disease control