The effects of sorting on orange (Thomson navel) post-harvest diseases expansion
Abstract:
In order to investigate the effect of different stages of sorting line on the development of orange post-harvest disease, two independent experiments were conducted. In the first experiment, fruit sampling was done upon arrival at the workshop (control) and after imposing each sorting line stage included washing with water immersion, washing with fungicide-containing hot water, waxing, sorting, as well as the elimination washing with hot water containing fungicides from the last two levels of the sorting stage (waxing, sorting). The fruit decay was assessed in three phases (7, 14 and 21 days after keeping the fruits at germinator). In the second experiment, the control fruit and final product of sorting (waxed oranges washed and unwashed with fungicide-containig hot water) were kept for 45 days in cold storage. The results showed that green mold, blue mold, and sour rot are the common diseases in the oranges. No significant difference was observed between the sorting treatments in the two modes of washed and unwashed with fungicide containing hot water. Further, more the percent of disease incidence and mean the disease severity increased over the time. Control treatments had 5.9, 33.3 and 33.3 percent of disease incidence in 7, 14 and 21 days evaluation steps, respectively. In the second experiment, the disease incidence was significantly lower in control compared to the other two treatments. In conclusion, it can be stated that sorting, as it is, increases post-harvest diseases and the rate of fruits decay cannot be reduced by using hot water containing fungicide and wax.
Language:
Persian
Published:
Iranian Journal of Plant Protection Science, Volume:47 Issue: 2, 2017
Pages:
219 to 230
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