บทคัดย่องานวิจัย

หมวดหมู่ : ฐานข้อมูลงานวิจัย

Postharvest diseases of lychee in Australia, and their control.

Coates, L. M.; Johnson, G. I.; Sardsud, U.; Cooke, A. W.;

Development of postharvest handling technology for tropical tree fruits: a workshop held in Bangkok, Thailand, 16-18 July 1992. Year: 1994 Pages: 68-69 Ref: 4 ref.

1994

บทคัดย่อ

Postharvest diseases of lychee in Australia, and their control.

ABSTRACT

A range of fungi previously isolated from diseased Litchi chinensis fruit were tested for pathogenicity in Kwai May Pink and Wai Chee L. chinensis fruit. The pathogenicity of the following genera of fungi was confirmed in both wounded and unwounded fruit: Phomopsis, Phoma, Colletotrichum, Alternaria, Dothiorella, Lasiodiplodia, Fusarium, Stemphylium and Curvularia. Postharvest sulfur dioxide (SO2)-treatment using either SO2 slow-release pads or SO2 fumigation was evaluated for disease control in L. chinensis fruit. Sulfur dioxide slow release pads provided good disease control, but caused bleaching of the pericarp. Partial recovery of pericarp colour occurred after removal of the SO2 slow-release pads. Penicillium sp. colonized incompletely-fumigated fruit. Sulfur dioxide fumigation (1% SO2 for 20 minutes) also controlled diseases resulting from latent infections of Colletotrichum sp. and Alternaria sp., although treated fruit were highly susceptible to colonization by Penicillium sp. The applic

ation of prochloraz to fruit following SO2 treatment prevented the development of blue mould (Penicillium sp.). Benomyl, imazalil and iprodione were all ineffective in controlling blue mould in SO2-treated fruit. Hot benomyl (at 50 or 52 deg C) and prochloraz treatments were effective in controlling postharvest disease lesions (Alternaria alternata, Phomopsis sp. and other fungi) on L. chinensis cv. Bengal during storage at 5 deg for up to 30 d. Despite its demonstrated disease control efficacy, prochloraz caused tainting of the aril in the thin-skinned cultivar Kwai May Pink. The fungicides imazalil and iprodione did not give acceptable control of postharvest disease in cool-stored Bengal L. chinensis.