Post harvest diseases fruits and vegetables - Xavier University ...

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FREEDOM PALESTINE FREEDOM PALESTINE FREEDOM PALESTINE Physical Means 213 In Penicillium digitatum-mocnlsited citrus fruit, a combined treatment of hot water (52°C, 5 min) and gamma irradiation (0.5 kGy) delayed the appearance of green rot by 33-40 days (Fig. 36) (Barkai-Golan et al., 1969). Combining irradiation (0.75 kGy) with the conventional hot water treatment (50°C, 10 min) prolonged the shelf life of papayas by 9 days beyond the prolongation achieved by heating alone, facilitating the distribution of South African fruits within that country and making large-scale export by sea possible (Brodrick and Thomas, 1978). Hot water (55°C, 5 min) plus irradiation (0.75 kGy) also act synergistically in controlling anthracnose (Colletotrichum gloeosporioides) in mangoes. This treatment is commercially used for treating mangoes in South Africa, both for decay control and for quarantine control of the mango seed weevil (Sternochetus mangiferae) (Brodrick and Thomas, 1978). A study on South African cultivars of plums and nectarines has shown that a hot water dip (46°C, 10 min) enabled the suppression of postharvest 100 •5 60 + c o a: 30 40 50 0 20 Days after inoculation Control #- Irradiation only A k Heat only (3 min) Irradiation + 3 min. Heat A A Heatonly (5min)o----0 Irradiation + 5 min. Heat A A 40 50 Fig. 36. Effects of combined treatments of heat and gamma radiation upon inactivation of Penicillium digitatum in inoculated Shamouti oranges. (Reproduced from Barkai-Golan et al., 1969 with permission of the American Phytopathological Society). http://arab2000.forumpro.fr
FREEDOM PALESTINE FREEDOM PALESTINE FREEDOM PALESTINE 214 Postharvest Diseases of Fruits and Vegetables Photo 3. Sprouting inhibition of potatoes by gamma irradiation. Photo 4. Sprouting inhibition of onions by gamma irradiation. http://arab2000.forumpro.fr
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