First Report of Anthracnose Caused by Elsinoe ampelina on Muscadine Grapes (Vitis rotundifolia) in Northern Florida

Abstract

Anthracnose of grapes is an economically devastating disease caused by Elsinoe ampelina (2). Warm, humid weather favors disease development, and therefore in the United States, it is generally restricted to grape-growing areas east of the Rocky Mountains. Vitis vinifera is highly susceptible to the disease, which is one of the principal factors preventing the development of an industry with this high-quality grape in the southeastern United States. Growers in this area produce local species-such as muscadine grapes (V. rotundifolia Michx.) and hybrids. Muscadine grapes are known for their resistance or “immunity” to many diseases found in bunch (Euvitis spp. Planch.) grape species (1). As yet, there has been no formal report of anthracnose or its causal agent on muscadine grapes. E. ampelina was detected on muscadine leaves for the first time in the experimental vineyard at the Center for Viticulture and Small Fruit Research during the summer of 2006. Approximately 40% of the 52 muscadine cultivars in the collection showed circular or irregular black spots typical of anthracnose mainly on young leaves and tendrils. However, no symptoms were observed on fruits, shoot tips, or any other plant part. To confirm the causal agent, infected leaves were surface sterilized with 75% ethanol, dipped in 2% sodium hypochlorite for 15 s, rinsed in distilled water, dissected into small 0.5-cm leaf discs, and plated on potato dextrose agar (PDA) and incubated at 28°C. Single-spore isolates were grown on PDA. Colonies were slow growing and appeared as dark red mounds with some mycelia. Conidia were cylindrical and hyaline with pointed ends consistent with previous reports for E. ampelina (2). The identity was also confirmed by using the following PCR primers to the 18S RNA: left primer; TCCGTAGGTGAACCTGCGGA and right primer; TCCTACCTGAT CCGAGGTCA designed on the basis of the alignment of E. ampelina sequences deposited in NCBI database. To fulfill Koch's postulates, symptoms were reproduced by artificial inoculation onto young muscadines (cv. Carlos) and bunch (cv. Cabernet Sauvignon) grapevines. A conidial suspension was prepared from single-conidial cultures, and three experimental vines of each species were sprayed with 0.5 ml of suspension (2 × 105 conidia per ml), whereas three control plants were sprayed with distilled water. The plants were incubated in a moist chamber at 28°C with 16 h of light. The first typical symptoms appeared on V. vinifera 4 days postinoculation and on the muscadines 6 days postinoculation. To our knowledge, this is the first report confirming anthracnose disease on muscadine grapes. References: (1) J. Lu et al. Acta Hortic. 528:479, 2000. (2) R. C. Pearson and A. C. Gohen. Anthracnose. Pages 18–19 in: Compendium of Grape Diseases. The American Phytopathological Society. St. Paul, MN, 1994.

Phylogeny, morphology and pathogenicity of Elsinoë ampelina, the causal agent of grapevine anthracnose in Brazil and Australia

“…In previous studies, morphological features were used partially to characterize E. ampelina (Poolsawat et al., ; Schilder et al., ; Sompong et al., ; Yun et al., ). In this study, cultural and conidial features from Brazilian and Australian isolates also offered substantial information to support the species identification.…”

“…Grape species such as Vitis labrusca, V. vinifera, V. rotundifolia, V. riparia and Vitis sp. (hybrids) are susceptible to anthracnose (Barros et al, 2015;Kono, Sato, Ban, & Mitani, 2013;Louime et al, 2011;Yun, Louime, & Lu, 2007). Generally, table grape cultivars are more susceptible to anthracnose than wine grape cultivars (Hart, Magarey, Emmett, & Magarey, 1993;Kono et al, 2013).…”

Morphological characterization and optimization of conditions for conidial production of Elsinoë ampelina, the causal organism of grapevine anthracnose

“…The genomic DNA of E. ampelina isolates YL-1 was extracted using the CTAB method (Möller, Bahnweg, Sandermann, & Geiger, 1992). The ITS region was amplified using the forward primer (5′-TCCGTAGGTGAACCTGCGGA-3′) and reverse primer (5′-TCCTACCTGATCCGAGGTCA-3′) described by Yun, Louime, and Lu (2007). PCR reaction was carried out in a final volume of 20 μl composed of TaKaRa Ex Taq (5U μl −1 ), 10 × Ex Taq buffer, 0.2 μM dNTPs, 0.2 μM primers, and 100 ng template DNA.…”

Comparative transcriptome analysis of leaves from two grapevine species reveals an early gene expression profile associated with Elsinoe ampelina resistance

“…However, bacterial, fungal and viral pathogen diseases, such as powdery mildew (Erysiphe necator), downy mildew (Plasmopara viticola), Botrytis cinerea, and anthracnose (Elsinoe ampelina) are major limiting factors in grapevine production and quality. E. ampelina is a biotrophic fungus originating in European grapes that can cause devastating disease in most of the world's grape producing areas, but especially in areas with high rainfall [1,2]. The pathogen attacks all young parts of the grapevine, such as leaves, tendrils, fruits and petioles.…”

“…As the disease progresses, the symptoms usually appear as numerous circular spots, which enlarge and become sunken, resulting in lesions with round edges [1]. High temperatures and humidity are known to contribute to occurrence of the disease and associated fungal growth [2]. The breeding of grape cultivars that are resistant to anthracnose is an important objective, and previous studies have shown that while European V. vinifera cultivars are highly susceptible, American grapes and Vitis hybrids exhibit varying levels of resistance [3].…”