Postharvest control of mango diseases. [Workshop paper]
1994
Johnson, G.I. (Commonwealth Scientific and Industrial Research Organisation, St Lucia (Australia). Div. of Horticulture) | Coates, L.M. | Cooke, A.W. (Queensland Dept. of Primary Industries, Indooroopilly (Australia). Plant Pathology Branch) | Wells, I.A. (Queensland Dept. of Primary Industries, Walkamin (Australia). Horticulture Postharvest Group)
In Australia, the current recommendation for postharvest control of anthracnose (Colletotrichum gloeosporioides) in mango is a 5-minute heating (52 deg. C) benomyl dip or a 30-second unheated overhead spray of prochloraz on the packing line. This research demonstrated the diminishing efficacy of these fungicides during the long-term (4-6 weeks) cool or controlled atmosphere storage. When applied alone, both fungicides gave unacceptable control of anthracnose under long-term storage conditions (26 days in 5 percent O2 per 2 percent CO2 at 13 deg. C, then 11 days in air at 20 deg. C). A dual treatment consisting of hot benomyl followed by prochloraz was shown to give superior control of anthracnose under these storage conditions. It was shown that rain at harvest increased disease severity, resulting in reduced efficacy of hot benomyl treatment. Mangoes harvested during wet weather were also more susceptible to brush damage following hot benomyl treatment at 52 deg. C for 5 minutes. Brush damage was reduced or eliminated by applying benomyl at 50 deg. C for 4 minutes. Disease control, however, was not satisfactory. Mangoes harvested in wet weather require careful handling to ensure adequate disease control and to avoid brush damage.
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