Minimizing fruit rot disease of mandarin citrus cv. ‘Sai-Namphaung’ with heat treatment
Salamat, K.; Jitareerat, P.; Songchote, S. and Kanrayanarat, S.
Proceedings of the APEC symposium on postharvest handling systems Bangkok, Thailand September 1-3, 2003. p. 373
2003
บทคัดย่อ
Minimizing fruit rot disease of mandarin citrus cv. ‘Sai-Namphaung’ with heat treatment
Mandarin citrus fruits cv. Sai-Namphaung were obtained from Thanathorn orchard, Chiang-Mai, Thailand. The fruit rot diseases were determined in citrus fruits stored at 20°C for three weeks and the pathogens were then isolated and identified. The major pathogens were Penicillium digitatum, Colletotrichum sp., Fusarium sp. and Alternaria sp. P. digitatum was the dominant pathogen, accounting for more than 40% of disease incidence. Spore germination of P. digitatum treated with hot water at 40, 44, 48, and 52°C for 10 min was tested. The highest reduction of spore germination was obtained at 52°C. In in vivo test using P. digitatum inoculated fruits, lowest disease incidence was observed in fruits treated with 48°C for 10 min. Using higher water temperatures of 52-58°C for 2-8 minutes did not control fruit rot and resulted to heat damage. No antifungal compounds on the peel of citrus fruits were detected by thin layer chromatography.