The efficacy of thermotherapy in control of bacterial soft rot of carrot during post-harvest period
Aghaei, Zeinab | Yousefi Kopaei, Fatemeh
Soft rot is an important disease of carrot in the field and during post-harvest period. Considering the fresh consumption of carrot, the use of chemical pesticides makes the product unsafe. So, in this study the efficiency of thermotherapy, as a safe method, was assessed for control of soft rot. Warm air and warm water at temperatures of 40, 45 and 50ºC in different time periods were applied. The inoculation was done by wounding at two sites in each sample and soaking them in bacterial suspension (OD600= 0.3). The samples were packed in plastic bags separately. Twenty-four hours after inoculation heat treatments were conducted. One week later, the results were evaluated by measuring the weight of rotted tissues in each sample. The samples treated by sodium hypochlorite and oxytetracycline solutions and the ones with no chemical or heat treatment were used as control groups. The experiment was accomplished in a completely randomized design by three replicates. Means comparison was performed by Duncan's test at 5% level. The effect of treatments on the weight loss percentage of carrots was also measured. The results showed the positive effect of thermotherapy in significant decrease of rotting. Among tested heat treatments, the most effective one was warm air at 50oC for 10min.There was no significant difference in percentage of weight loss between this treatment and non- treated samples.
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