Cobalt-60 gamma irradiation as a post-harvest treatment for the control of anthrachnose and the quality of the ʻTommy Atkinsʼ mango
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Abstract
The management of anthracnose caused by Colletotrichum spp. is crucial for postharvest mango production, given its high impact on fruit quality and commercial value. This study aimed to evaluate the effect of gamma irradiation with Cobalt-60 (⁶⁰Co) on anthracnose control and its impact on the postharvest quality of 'Tommy Atkins' mango. Doses of 0.25 kGy, 0.5 kGy, and 1 kGy were applied to physiologically ripe fruits, which were stored for 14 days at 13 °C and 85–90% relative humidity. Disease incidence and severity were assessed, as well as quality indicators such as mass loss, firmness, total soluble solids (TSS), and titratable acidity. The results showed that doses of 0.5 kGy and 1 kGy significantly reduced the incidence and severity of anthracnose, with the affected area remaining below 10%, while maintaining commercial quality. The 1 kGy dose induced greater browning and darkening of the lenticels in the exocarp. Ripening indicators (firmness, TSS, and acidity) were not negatively affected by irradiation, showing similar performance to the control. It was concluded that gamma irradiation with ⁶⁰Co at 0.5 kGy was the most effective, as it effectively controlled the disease, preserved the internal and external quality of the fruit, and demonstrated the potential to extend its shelf life, facilitating its commercialization in export markets under food quality and safety standards.
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