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Concomitant Decay Reductions when Mangoes Are Treated with Heat to Control Infestations of Caribbean Fruit Flies. Raymond G. McGuire, Agricultural Research Service, U.S. Department of Agriculture, Subtropical Horticulture Research Station, 13601 Old Cutler Road, Miami, FL 33158. Plant Dis. 75:946-949. Accepted for publication 18 March 1991. This article is in the public domain and not copyrightable. It may be freely reprinted with customary crediting of the source. The American Phytopathological Society, 1991. DOI: 10.1094/PD-75-0946.

Four heat treatments for quarantine control of Caribbean fruit flies (Anastrepha suspensa) in mango (Mangifera indica) did not affect fruit quality but variably controlled two postharvest diseases. Immersion of fruit in water at a constant temperature of 46 C for 90115 min significantly reduced anthracnose (Colletotrichum gloeosporioides) on three cultivars by 6087%. Stem end rot (Diplodia natalensis) also was reduced 6188% by this treatment. Treatment by forced air at 46 C for 195 min or at 48 C for 150 min reduced anthracnose on two cultivars, but an immersion for 150 min in which the water temperature gradually rose to 48 C, following a gradient identical to that created by forced air treatment, had no effect on disease severity. Although all heat treatments led to increased weight loss during 2 wk of storage, fruit treated by gradient hot water immersion were least affected. Hot air treatment and gradient hot water immersion slightly accelerated the softening of fruit, and all heat treatments hastened the development of yellow pigmentation. Immersion in water at a constant temperature of 46 C is recommended for the disinfestation of mangoes because it most effectively controls disease without reducing market quality. Forced air treatment at 48 C, however, is tolerated by the fruit and is more effective than forced air at 46 C for disease control.