Colonization of Delicious Apple Fruits byAlternariaspp. and Effect of Fungicide Sprays on Moldy-Core

1 January 1983

journal article
research article
Published by Scientific Societies in Plant Disease

Vol. 67 (2) , 150-152
https://doi.org/10.1094/pd-67-150

Abstract

The following genera of fungi were isolated from the core region of ''Delicious'' apple fruits: [Alternaria, Botrytis, Candida, Cladosporium, Coniothyrium, Fusarium, Aspergillus, Gloeosporium, Epicoccum, Penicillium, Pestalotia, Phoma, Sporothrix, Trichoderma and Rhizopus]. Alternaria spp. were the most commonly isolated fungi. Alternaria spp. colonized flower parts during and shortly after bloom and later moved (presumably through the open calyx tube) into the receptacle or core region of the fruit. During 2 yr of testing in Ohio [USA], Alternaria was recovered from the core region of almost 100% of all ''Delicious'' fruits tested at harvest. The mean percentage of fruit with moldy-core (visible mycelia in the core region at harvest) was 38 and 65% in 1980 and 1981, respectively. A variety of fungicide spray programs had no effect on the rate of flower and fruit colonization by Alternaria spp. or on the incidence of moldy-core at harvest.

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