ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Effects of postfumigation washing treatments and storage temperature on disease development in fresh longan.

Sardsud, V.; Sardsud, U.; Sittigul, C.; Chaiwangsri, T.;

Development of postharvest handling technology for tropical tree fruits: a workshop held in Bangkok, Thailand, 16-18 July 1992. Year: 1994 Pages: 77-79 Ref: 3 ref.

1994

บทคัดย่อ

ABSTRACT

Longan fruit with and without prior fumigation in sulfur dioxide (SO2) were subdivided into 3 groups. One group remained unwashed, and was packed in plastic punnets and overwrapped with PVC film, the second group was washed in sterile distilled water in the lab., while the third group was washed in water that had been collected from a longan fruit washing tank, before air drying and packing as described. The treated fruit were stored at either 28, 10 or 8 deg C and disease development was monitored daily. Skin browning began to appear in unfumigated fruit within 1 d of treatment, with development most rapid at 25 deg . The spectrum of fungi associated with the browning was similar, regardless of washing treatment. Lasiodiplodia [Botryodiplodia] theobromae, Pestalotiopsis sp., Cladosporium sp. and Fusarium spp. were frequently isolated from the dark skin areas that became covered with mycelium, and Aspergillus niger and other fungi were occasionally detected. The fruit that had been fumigated wit

h SO2 showed no signs of skin browning or disease, even following storage at 10 or 5 deg for up to 11 months (however, in this time the pulp shrank). At 25 deg the fumigated fruit turned brown within 2 months and dark brown in 5 months.