Biology and Epidemiology of Venturia Species Affecting Fruit Crops: A Review

González‐Domínguez, Elisa; Armengol, Josep; Rossi, Vittorio

doi:10.3389/fpls.2017.01496

Cited by 75 publications

(57 citation statements)

References 113 publications

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“…Venturia are widespread fungal pathogens that cause scab disease on pecan (V. effusa), apples (V. inaequalis), pear (V. pyrina and V. nashicola) and peach (V. carpophila) (González-Domínguez et al 2017). Pecan scab is polycyclic during the growing season and most prominent on leaves, twigs and shucks.…”

Section: Genome Announcementmentioning

confidence: 99%

Chromosome-level genome reference ofVenturia effusa, causative agent of pecan scab

Winter

Krom

et al. 2019

Preprint

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Pecan scab, caused by Venturia effusa, is a devastating disease of pecan (Carya illinoinensis), which results in economic losses on susceptible cultivars throughout the southeastern U.S. To enhance our understanding of pathogenicity in V. effusa, we have generated a complete telomere-to-telomere genome reference of V. effusa isolate FRT5LL7-Albino. By combining Illumina MiSeq and Oxford Nanopore MinION data, we assembled a 45.2 Mb genome represented by 20 chromosomes and containing 10,820 genes, of which 7,619 have at least one functional annotation. The likely causative mutation of the albino phenotype was identified as a single base insertion and a resulting frameshift in the gene encoding the polyketide synthase ALM1. This genome represents the first full chromosome level assembly of any Venturia species. Literature CitedAl-Samarrai, T., and Schmid, J. 2000. A simple method for extraction of fungal genomic DNA.Lett. Appl. Microbiol. 30:53-56.

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Section: Genome Announcementmentioning

confidence: 99%

Chromosome-level genome reference ofVenturia effusa, causative agent of pecan scab

Winter

Krom

et al. 2019

Preprint

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“…Ascospores of Venturia species can play an important role not just as a vehicle of novel diversity, but also as a component of the epidemiology of the disease (González-Domínguez et al 2017). Studies from other Venturia species may aid in identifying the role of ascospores in the epidemiology of pecan scab.…”

Section: Discussionmentioning

confidence: 99%

“…Based on these observations we propose that V. effusa must have a functional sexual stage that is yet to be observed in the field. Closely related species of Venturia (Schubert et al 2003), including V. inaequalis on apple, V. nashicola on pear, and V. carpohila on peach and apricot have a characterized sexual stages in the field in at least some areas (Fisher 1961;Umemoto 1990;MacHardy 1996;González-Domínguez et al 2017). In some areas, ascospores of V. nashicola may play a bigger role in epidemics of pear scab than previously thought (Lian et al 2006;Lian et al 2007).…”

Section: Introductionmentioning

confidence: 99%

First description of the sexual stage ofVenturia effusa, causal agent of pecan scab

Charlton

Bock

et al. 2019

Preprint

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Venturia effusa, cause of pecan scab, is the most prevalent disease of pecan in the southeastern USA; epidemics of the disease regularly result in economic losses to the pecan industry. Recent characterization of the mating type distribution revealed the frequency of the MAT idiomorphs are in equilibrium at various spatial scales, indicative of regular sexual recombination. However, the occurrence of the sexual stage of V. effusa has never been observed, and the pathogen was previously believed to rely entirely on asexual reproduction. To explore the existence of a sexual cycle, we paired opposite mating types on oatmeal culture media. In initial experiments, cultures were incubated at 24 C for 2 mo for hyphal interactions to occur between mating types and then maintained at 4 C for 4 mo. Immature pseudothecia were initially observed but following exposure to a 12 h photoperiod for 2 weeks at 24 C, asci and ascospores developed. Further experiments explored the effect of time on pseudothecial development with 4 mo at 4 C as the optimal requirement. The results of this study demonstrate the heterothallic nature of V. effusa. Following experiments investigated progeny from a sexual cross of an albino and a wild-type isolate. Evaluation of isolate pigmentation, mating type, and multilocus genotyping of single ascospore progeny provided evidence that recombination occurred within the sexual crosses. The impact of determining the source of the overwintering ascostroma will aid in management decisions to reduce the primary inoculum in the disease cycle.

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“…Vin: Venturia inaequalis (apple scab); Vna: Venturia nashicola (Asian pear scab); Vpy: Venturia pyrina (European pear scab). Adapted from González‐Domínguez et al., .…”

Section: Pest Categorisationmentioning

confidence: 99%

Pest categorisation of Venturia nashicola

Jeger¹,

Bragard²,

Caffier³

et al. 2017

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The Panel on Plant Health performed a pest categorisation of Venturia nashicola, the causal agent of Asian pear scab, for the European Union (EU). The pathogen is a well-defined, distinguishable fungal species affecting Pyrus pyrifolia var. culta, P. ussuriensis and P. bretschneideri in Asian countries. P. communis (European pear) is not a host of V. nashicola, but the host status of other Pyrus species is unclear. V. nashicola is not known to occur in the EU. It is listed in Annex IIAI of Directive 2000/29/EC. The pathogen could potentially enter the EU on host plants for planting and fruit originated in infested countries. There are no climatic factors limiting the potential establishment and spread of the pathogen in the EU, as its epidemiology is similar to those of Venturia inaequalis (apple scab) and Venturia pyrina (European pear scab), which are well-established in the EU. The hosts are present in the EU, but no data were found on their abundance and distribution. In the infested areas, V. nashicola causes premature leaf and fruit drop and fruit distortion resulting in considerable yield/quality losses. The introduction of the pathogen into the EU could cause yield/quality losses and environmental consequences because of the additional fungicide sprays for disease control. Cultural practices and chemical measures applied in the infested areas reduce the inoculum sources but they cannot eliminate the pathogen. Phytosanitary measures are available to mitigate the risk of introduction and spread of the pathogen in the EU. All criteria assessed by EFSA for consideration as a potential Union quarantine pest are met. As V. nashicola is not known to occur in the EU, this criterion assessed by EFSA to consider it as a Union regulated non-quarantine pest is not met.

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Biology and Epidemiology of Venturia Species Affecting Fruit Crops: A Review

Cited by 75 publications

References 113 publications

Chromosome-level genome reference ofVenturia effusa, causative agent of pecan scab

Chromosome-level genome reference ofVenturia effusa, causative agent of pecan scab

First description of the sexual stage ofVenturia effusa, causal agent of pecan scab

Pest categorisation of Venturia nashicola

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