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Zhanao Deng, Brent K. Harbaugh and Natalia A. Peres

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Zhanao Deng, Brent K. Harbaugh and Natalia A. Peres

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Zhanao Deng, Brent K. Harbaugh and Natalia A. Peres

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Teresa E. Seijo, Natalia A. Peres and Zhanao Deng

Bacterial blight, caused by Xanthomonas axonopodis pv. dieffenbachiae (Xad), is the most common foliar disease of caladium, an ornamental aroid grown for its colorful foliage. The disease can reduce the marketability of caladiums produced as potted plants and lower the yield of caladiums grown for tuber production. Three bacterial strains were isolated from symptomatic caladiums and identified as Xad using fatty acid analysis, carbon source use, and the sequence of the 16S-23S spacer, and tested for virulence against three susceptible cultivars. Two strains were virulent to all of the cultivars; however, one strain was differentially pathogenic, virulent against two cultivars, but not to the usually highly susceptible ‘Candidum’. In greenhouse inoculation tests of 17 cultivars and one breeding line, four cultivars were ranked as highly susceptible, nine as moderately susceptible, and five as resistant. Ten of these cultivars were also evaluated with natural infection in the field with good agreement between the results of the greenhouse and field evaluations. Cultivars White Queen, Florida Red Ruffles, Florida Sweetheart, Candidum Jr., and Mrs. Arno Nehrling have been identified as resistant to bacterial blight in greenhouse or field evaluations and can potentially be used in future breeding efforts to produce improved cultivars.

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Zhanao Deng, Brent K. Harbaugh and Natalia A. Peres

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Zhanao Deng, Brent K. Harbaugh and Natalia A. Peres

Free access

Zhanao Deng, Brent K. Harbaugh and Natalia A. Peres

Free access

Zhanao Deng, Brent K. Harbaugh and Natalia A. Peres

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Douglas A. Phillips, Philip F. Harmon, James W. Olmstead, Natalia A. Peres and Patricio R. Munoz

‘Flicker’ is a southern highbush blueberry (SHB, Vaccinium corymbosum) cultivar frequently selected by growers in Central and South Florida. In 2014, several growers in Central Florida experienced issues with anthracnose stem lesions and twig dieback on ‘Flicker’, resulting in a reduction in new plantings and the removal of many existing plantings. The objective of this study was to determine the level of anthracnose susceptibility of certain commercially available SHB cultivars, which information can be used to limit further use of susceptible cultivars in the University of Florida blueberry breeding program. The screening was performed using a spray inoculation of a virulent Colletotrichum gloeosporioides isolate onto whole V. corymbosum plants, followed by measurement of incidence and severity of disease over time. In repeated experiments, ‘Flicker’ and two other cultivars had a significantly higher mean number of lesions and area under the disease progress curve (AUDPC) than any other tested cultivar, and in both experiments, the observed lesions were similar in many respects to those previously reported on northern highbush blueberry (also V. corymbosum). Although the results of these experiments may ultimately indicate that Flicker has a unique genetic susceptibility to this form of anthracnose among SHB cultivars commercially grown in Florida, screening of additional cultivars must be performed for confirmation.