Biology and Earth Science Faculty Scholarship

Document Type

Article

Publication Date

6-16-2007

Publisher

The American Phytopathological Society

Keywords

fruit mummification, fruit rot

Abstract

Monilinia vaccinii-corymbosi, the causal agent of mummy berry disease, infects blueberry flowers via the gynoecial pathway. To describe the expression of host resistance in highbush blueberry (Vaccinium corymbosum), fungal growth in the styles and colonization of the locules were compared among five blueberry cultivars in a series of controlled greenhouse experiments. Styles were harvested 1 and 4 days postinoculation, and the length colonized by hyphae was determined using fluorescence microscopy. At 8 weeks after inoculation, fruit were harvested and scored for the presence of hyphae in the locules. The infection frequency of styles ranged from 0.33 to 0.71, and only cv. Weymouth had significantly lower infection frequency than the other cultivars. The mean length of the colonized portion of the stylar canal ranged from 0.126 to 0.434 mm after 1 day and 1.62 to 3.59 mm after 4 days. Hyphae in the styles of cv. Weymouth exhibited the least growth, whereas hyphae in the styles of cultivars Jersey and Rancocas were significantly longer. The distance of style penetrated for cultivars Bluecrop and Coville was intermediate. The mean disease incidence of locules differed significantly. Values for cultivars Weymouth and Jersey were the smallest (0.038 and 0.039) and largest (0.249 and 0.236), respectively. The results demonstrate that a component of resistance to infection by M. vacciniicorymbosi is expressed during growth in the gynoecial pathway.

First Page

852

Last Page

856

Volume

91

Issue

7

Original Citation

Lehman, J. S., Igarashi, S., & Oudemans, P. V. (2007). Host Resistance to Monilinia vaccinii-corymbosi in Flowers and Fruits of Highbush Blueberry. Plant Disease, 91(7), 852-856. doi:10.1094/pdis-91-7-0852

DOI

10.1094/pdis-91-7-0852

Version

Publisher's Version

Peer Reviewed

1

Creative Commons License

Creative Commons Attribution 4.0 License
This work is licensed under a Creative Commons Attribution 4.0 License.

Included in

Biology Commons

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