Fungal diseases of non-conventional food plants: first report of Stagonosporopsis caricae causing leaf spots on Vasconcellea monoica

Bracale, Marina Faria; Nóbrega, Thaisa Ferreira; Barreto, Robert W.

doi:10.1007/s13314-020-00391-y

Cited by 7 publications

(4 citation statements)

References 16 publications

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“…Morphological characteristics of fungal species can be a factor in identifying isolates at the species level. Reports about Stagonosporopsis cucurbitacearum, a fungal species closely related with the isolate CMML20-2, have described similar colonies, conidia, and conidiomata morphology [24,[37][38][39][40] with S. caricae [41,42]. The isolates CMML20-7 and CMML20-8 showed identical morphological characteristics with A. alternata.…”

Section: Discussionmentioning

confidence: 94%

Identification and Characterization of Foliar Fungi Associated with Beach Vitex (Vitex rotundifolia L.)

Park

Paul

Lee

et al. 2023

Forests

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The beach vitex (Vitex rotundifolia L.), a member of the Lamiaceae family, is a salt-tolerant, woody perennial common in coastal areas worldwide. Plant–fungal association was monitored in the shoreline forest area of Wando Island in Korea in 2020, and leaf samples showing leaf spot disease were collected. Eight fungal isolates were recovered from the samples on PDA and identified based on the morphological characteristics and multilocus molecular phylogeny. Among the eight isolates, four were identified as Alternaria alternata, two as Fusarium humuli, one as Colletotrichum aenigma, and one as Stagonosporopsis caricae. Pathogenicity tests of the fungal isolates on the detached leaves of beach vitex revealed that S. caricae CMML20–2 and A. alternata (CMML20–7, CMML20–8, CMML20–9, and CMML20–10) caused disease lesions while the other species did not. The fungal species S. caricae, C. aenigma, and F. humuli are the first reported in the host worldwide, and S. caricae and F. humuli are first reported in Korea. In vitro fungicide sensitivity assays were carried out based on a measurement of diametrical mycelial growth on media amended with different doses of the fungicides fludioxonil, metconazole, and fluxapyroxad. Fungicide sensitivity varied significantly among the species, and the A. alternata and S. caricae isolates were more sensitive to fluxapyroxad than the other isolates. Our study contributes to the understanding of fungal diversity in forest mycology and demonstrates that pathogenic fungi including A. alternata and S. caricae might accelerate decline in leaf health.

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Section: Discussionmentioning

confidence: 94%

Identification and Characterization of Foliar Fungi Associated with Beach Vitex (Vitex rotundifolia L.)

Park

Paul

Lee

et al. 2023

Forests

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“…Stagonosporopsis, one of the genera in Didymellaceae, can cause many important plant diseases [28]. Stagonosporopsis caricae was reported causing leaf spots on the non-conventional fruit crop, Vasconcellea monoica (Caricaceae) in Brazil [29]. Stagonosporopsis chrysanthemi caused ray blight of chrysanthemum and pyrethrum and is present worldwide [30].…”

Section: Discussionmentioning

confidence: 99%

Stagonosporopsis pogostemonis: A Novel Ascomycete Fungus Causing Leaf Spot and Stem Blight on Pogostemon cablin (Lamiaceae) in South China

et al. 2021

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Pogostemon cablin is one of the well-known Southern Chinese medicinal plants with detoxification, anti-bacterial, anti-inflammatory, and other pharmacological functions. Identification and characterization of phytopathogens on P. cablin are of great significance for the prevention and control of diseases. From spring to summer of 2019 and 2020, a leaf spot disease on Pogostemon cablin was observed in Guangdong Province, South China. The pathogen was isolated and identified based on both morphological and DNA molecular approaches. The molecular identification was conducted using multi-gene sequence analysis of large subunit (LSU), the nuclear ribosomal internal transcribed spacer (ITS), beta-tubulin (β-tubulin), and RNA polymerase II (rpb2) genes. The causal organism was identified as Stagonosporopsis pogostemonis, a novel fungal species. Pathogenicity of Stagonosporopsis pogostemonis on P. cablin was fulfilled via confining the Koch's postulates, causing leaf spots and stem blight disease. This is the first report of leaf spot diseases on P. cablin caused by Stagonosporopsis species worldwide.

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“…The GSB species complex is pathogenic to cucurbits; S. caricae is also pathogenic to papaya and Vasconcellea monoica (babaco‐mirim) (Bracale et al, 2020). S. citrulli (RG I isolates) was highly virulent on inoculated cantaloupe ( C. melo ) seedlings with a mean disease severity of 71%, while S. cucurbitacearum (RG II isolates) and S. caricae (RG IV isolates) were slightly virulent with a mean disease severity of 4%.…”

Section: Gsb Species Complexmentioning

confidence: 99%

Gummy stem blight: One disease, three pathogens

Seblani

Keinath

Munkvold

2023

Molecular Plant Pathology

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Gummy stem blight (GSB) is a major disease of cucurbits worldwide. It is caused by three fungal species that are morphologically identical and have overlapping geographic and host ranges. Controlling GSB is challenging due to the lack of resistant cultivars and the pathogens' significant ability to develop resistance to systemic fungicides. The causal agent of GSB is recognized as a complex of three phylogenetically distinct species belonging to domain Eukaryota, kingdom Fungi, phylum Ascomycota, subphylum Pezizomycotina, class Dothideomycetes, subclass Pleosporomycetida, order Pleosporales, family Didymellaceae, genus Stagonosporopsis, species cucurbitacearum, citrulli, and caricae. Pycnidia are tan with dark rings of cells around the ostiole measuring 120-180 μm in diameter. Conidia are 6-13 μm long, hyaline, cylindrical with round ends, and non-or monoseptate.Pseudothecia are black and globose in shape and have a diameter of 125-213 μm.Ascospores are 14-18 × 4-6 μm long, hyaline, ellipsoidal with round ends, and monoseptate with a distinct constriction at the septum. Eight ascospores are found per ascus. The upper end of the apical cell is pointed, whereas the lower end of the bottom cell is blunt. Species-specific PCR primers that can be used in a multiplex conventional PCR assay are available. The GSB species complex is pathogenic to 37 species of cucurbits from 21 different genera. S. cucurbitacearum and S. citrulli are specific to cucurbits, while S. caricae is also pathogenic to papaya and babaco-mirim (Vasconcellea monoica), a related fruit. Under favourable environmental conditions, symptoms can appear 3-12 days after spore germination. Leaf spots often start at the leaf margin or extend to the margins. Spots expand and coalesce, resulting in leaf blighting. Active lesions are typically water-soaked. Cankers are observed on crowns, main stems, and vines. Red to amber gummy exudates are often seen on the stems after cankers develop on cortical tissue.

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Fungal diseases of non-conventional food plants: first report of Stagonosporopsis caricae causing leaf spots on Vasconcellea monoica

Cited by 7 publications

References 16 publications

Identification and Characterization of Foliar Fungi Associated with Beach Vitex (Vitex rotundifolia L.)

Identification and Characterization of Foliar Fungi Associated with Beach Vitex (Vitex rotundifolia L.)

Stagonosporopsis pogostemonis: A Novel Ascomycete Fungus Causing Leaf Spot and Stem Blight on Pogostemon cablin (Lamiaceae) in South China

Gummy stem blight: One disease, three pathogens

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