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• W4283749001 abstract "Grapevine is one of the most widely-planted fruit crops in the world, and is the most economically important fruit crop in the state of New York, USA. Symptoms of anthracnose on grapevine are similarly widely-reported on grapevine fruit and foliage, and such symptoms are commonly attributed to Elsinöe ampelina (Wilcox et al., 2015). However, similar symptoms, if not identical, to those associated with E. ampelina have been sporadically attributed to various species in the genus Colletotrichum. In September 2021, a survey was conducted in three research vineyards at Cornell AgriTech in Geneva, NY. Symptoms of anthracnose werebserved on four Vitis interspecific hybrid breeding lines in a 1 ha vineyard. Leaves, fruit, and petioles showing symptoms of anthracnose, i.e., sunken necrotic lesions with grayish centers and brownish margins, were collected. Symptomatic and healthy portions of surface-sterilized tissues were placed on PDA medium and incubated at 23oC for 7 days. Several petiole samples yielded colonies of white to greyish mycelium, with some red to orange pigmentation (Fig. 1A and 1B), similar to those described by Chowdappa et al. (2009) for Colletotrichum species isolated from grapevine in India. Cultures were allowed to sporulate. Slides from cultures were prepared and examined at 400X magnification. Conidia from cultures were cylindrical with rounded ends, 13.5-15.2 μm in length and 7.6-9.0 μm in width (Fig. 1C). Koch's postulates were fulfilled by inoculating detached healthy leaves of V. vinifera 'Chardonnay' that had been surface sterilized in 10% sodium hypochlorite and triple-rinsed in sterile distilled water. Drop inoculation was used from a suspension of 105 conidia/ml from the foregoing pure cultures as five 2 µL droplets per leaf. Inoculated detached leaves were maintained on water agar in a Petri dish at 23oC. Four days after inoculation, symptoms were observed and compared with the originally collected samples. Inoculated leaves displayed symptoms typically found on the collected tissues, and the original pathogen, as confirmed by colony morphology and conidial characteristics and dimensions, was reisolated from inoculated leaves, and not from non-inoculated controls. For molecular characterization, fungal DNA was isolated by using Qiagen DNeasy kit and amplified using the following primer pairs: ITS1/ITS4, TEF (Hyun et al., 2009), E. ampelina F/R (Santos et al. 2018), TUB2, ACT, HIS3, GAPDH and CHS1 (Damm et al., 2001). PCR products were purified using ExoSAP-IT, and samples were Sanger sequenced. Sequences were analyzed using Geneious Prime software, and the resulting sequences (NCBI accessions OL720215, OL720216, OL720217, OL720218, OL853836, OM982612, OM982613, OM982614, OM982615 and OM982616) had 94 to 100% identity to Colletotrichum fioriniae NCBI accessions MN944922.1, MK646015.1, MN944922.1, MN856415.1, KU847413.1, MN520490.1, MN544294.1, KY695259.1, MN535117.1 and MN544295.1. Symptoms of grapevine anthracnose caused by Colletotrichum species have been reported from India (Chowdappa et al., 2009) and Korea (Kim et al., 2021). To our knowledge this is the first report of grapevine anthracnose caused by C. fioriniae Anthracnose and ripe rot are diseases of increasing importance, particularly as new grapevine cultivars with resistance to powdery mildew or downy mildew are adopted. Taxonomy of the causal agents (E. ampelina and Colletotrichum spp.) has undergone considerable revision. Consequently, distribution and relative prevalence of the various taxa will require further study." @default.
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• W4283749001 date "2023-01-01" @default.
• W4283749001 modified "2023-09-27" @default.
• W4283749001 title "First Report of <i>Colletotrichum fioriniae</i> Causing Grapevine Anthracnose in New York" @default.
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• W4283749001 doi "https://doi.org/10.1094/pdis-03-22-0604-pdn" @default.
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