Dissertation/Thesis Abstract

Pathogenicity and Management of Cladosporium spp. Responsible for the Post Harvest Disease Brown Spot on Table Grape
by Young, Cassandra, M.S., University of California, Davis, 2016, 44; 10182740
Abstract (Summary)

Cladosporium is a widespread and heterogeneous genus. Cladosporium spp. can cause severe economic losses on several crops. One of the most important post-harvest diseases of table grapes is brown spot caused by Cladosporium spp. This disease is especially important in the San Joaquin Valley, the major production region of table grapes in California. Table grape varieties are especially vulnerable to brown spot because of their long-term postharvest storage, high sugar content, and the time spent in transport because of their popularity in international markets. There is a lack of knowledge about the etiology of brown spot and its causal agents. What is known is that brown spot is a latent infection by Cladosporium spp. that emerges and spreads post-harvest, causing severe economic losses and threatening the viability of table grape export from California. Disease incidence, pathogen virulence, and the fungistatic effect of low temperature were measured for C. ramotenellum, C. tenellum, C. cladosporioides and C. limoniforme. These species were confirmed pathogenic and are therefore part of the Cladosporium species complex associated with brown spot disease.

‘Red Globe’ table grapes (RG) are a commodity from California that is desirable in international markets such as Mexico and China. RG are harvested from late August to early November can remain in cold storage for three months or longer. Cladosporium spp., the causal agents of a post-harvest disease known as brown spot, cryptically infects berries, resulting in the harvest and storage of symptomless, infected berries. Brown spot occurs in several cultivars of table grapes, but causes severe economic losses in RG and ‘Crimson’ when disease emerges and spreads from berry to berry while in cold storage. Owing to a lack of knowledge regarding etiology and management of brown spot in California, the second chapter of this study was undertaken to examine the effect of cold storage conditions and sulfur dioxide (SO2) treatments on fungal growth and infection of grapes by four Cladosporium species, Cladosporium ramotenellum, Cladosporium tenellum, Cladosporium cladosporioides and Cladosporium limoniforme, all of which can cause brown spot.

Indexing (document details)
Advisor: Gubler, Walter D.
Commitee: Crisosto, Carlos H., Gordon, Thomas R.
School: University of California, Davis
Department: Plant Pathology
School Location: United States -- California
Source: MAI 56/01M(E), Masters Abstracts International
Subjects: Plant Pathology
Keywords: Cladosporium, Pathogenicity, Table grapes
Publication Number: 10182740
ISBN: 978-1-369-31055-9
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