ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Effect of chemical treatments and storage condition to control Alternaria black rot in sweet orange

Aboutalei A and Hasanzada H

Program and Abstracts, 11th International Citrus Congress (ISC Congress), 26-20 October 2008, Wuhan, China. 333 pages.

2008

บทคัดย่อ

Alternariablack rot, caused by Alternaria citri is an important problem in commercial storage of citrus. It can also be a problem for the processing industry by contaminating the juice. Sweet orange is o­ne of the sensitive citrus to Alternaria decay. In order to study the effect of chemical treatments and storage condition o­n postharvest life of sweet orange, this experiment was conducted in factorial arrangement based o­n CRD with four replications. Fruits were harvested in mid January. After washing and inoculation with Alternaria citri spores, grouped in two bulk and treated with Sodium Carbonate, Sodium Bicarbonate, Thiabendazole, Benomile, 2,4-D at different concentrations for 5 minutes. Control treatment fruits in two levels included none washed and washed with tap water. After treatments, fruits were kept in polyethylene bags individually. o­ne group of fruits were stored in ambient storage and others stored in cold storage at 6°C for 4 months. Results showed that percentage of decayed fruits was different among treatments and storage conditions. In cold storage decayed fruits were lesser and fruits had better appearance. Among treatments, Sodium carbonate 1000 mg/l had significantly the highest effect o­n decreasing fruits decay. Large amount of decayed fruits were observed in Benomile 500 mg/l treatment. General concluded that Sodium carbonate 1000 mg/l, Thiabendazole 1500 mg/l and 2,4-D 150 and 200 mg/l and stored at 6°Cwere the best treatments to control Alternaria black rot.

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