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Susceptibility of rabbiteye blueberry cultivars to postharvest diseases



Susceptibility of rabbiteye blueberry cultivars to postharvest diseases



Plant Disease 80(2): 215-218



Thirteen rabbiteye cultivars were surveyed for postharvest berry rots during the 1992, 1993, and 1994 harvest seasons. Disease incidence and severity were low, with lt 30% of berries displaying decay symptoms after 5 days incubation at 25 degree C with 100% relative humidity (RH). Although Botrytis fruit rot and ripe rot were equally severe in 1992, ripe rot was the most common postharvest disease in 1993 and 1994. Menditoo, Homebell, Beckyblue, and Premier blueberries had more than 40% rotted fruit, while Briteblue, Southland, and Tifblue had less than 16%. The pathogen associated with ripe rot was identified as Colletotrichum acutatum rather than the more commonly reported pathogen, C. gloeosporioides. When ripe berries from all 13 cultivars were inoculated with a conidial suspension of C. acutatum and incubated for 5 days at 25 degree C and 100% RH, all were infected with ripe rot. Tifblue, Delite, Premier, and Menditoo scored the highest for ripe rot, while Southland, Centurion, Woodard, Bluebell, and Homebell scored the lowest. Generally, inoculated berries from late-season harvests scored higher for ripe rot than did berries from earlier harvests. Two of the cultivars most susceptible to ripe rot, Tifblue and Premier, account for most of the rabbiteye blueberry production in the southeastern United States.

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Accession: 002973364

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