Evaluation of Chlorine Dioxide Treatment for Xanthomonas axonopodis pv. citri Bacterium Control
Treatments with chlorine dioxide (ClO2) to control the Xanthomonas axonopodis pv. citri (Xac) , the cause of citrus canker, were evaluated. Citrus canker is an endemic disease in the Argentine literal. In order to prevent the spread of this disease, packing houses are required by current regulations to use a treatment with 200 mg/L of sodium hypochlorite for 120 sec or 2％ sodium ortho phenyl phenate (SOPP) for 30 sec for all asymptomatic fruit. Chlorine dioxide is a water soluble gas with 2. 5 times higher oxidative power than sodium hypochlorite. The advantages of chlorine dioxide are that it is pH stable, does not oxidize by chlorination, and does not attack ferrous metals. Assays were performed: 1) in vitro in the lab; 2) on artificially inoculated fruits in the lab and 3) on infected fruit from the orchard in the packing house. Lab assays were performed using chlorine dioxide at 0. 1 to 5 mg/L concentrations for 2 sec to 300 sec exposure, at 6℃, 201 and 381. Minimum batericidal concentrations in vitro and on artificially inoculated fruits were 0.3 mg/L and 1 mg/L, respectively, at the aforementioned temperatures. Packing house assays were conducted by fruit immersion in dump tanks. Chlorine dioxide was generated in situ and applied at 1 to 6 mg/L for 120 s exposure time at a temperature range of 15. 6 to 211. Chlorine dioxide application was controlled using the oxidation reduction potential (ORP). ORP ranged from 760 to 782 mV. No viable Xac bacteria were detected in the water dump tanks, nor on asymptomatic fruit surface or in canker lesions on fruit from orchards.
Xanthomonas axonopodis pv citri Chlorine dioxide Postharvest
Varela Roberto A. Locaso Delia Vidal Carlos I. Winter Mariangeles
Departamento de Industrias, Facultad de Ciencias de la Alimentacion. Universidad National de Entre Rios,Concordia, Entre Rtos, Argentina
国际会议
11th International Citrus Congress(第11届国际柑橘大会)
武汉
英文
1042-1048
2008-10-01（万方平台首次上网日期，不代表论文的发表时间）