First Report of Blueberry Leaf Rust Caused by <i>Thekopsora minima</i> on Blueberry (<i>Vaccinium corymbosum</i>) in South America

Pazdiora, Paulo César; Dorneles, Keilor da Rosa; Filho, J. V. Araújo; Rossetto, Edemar Antonio; Guatimosim, Eduardo; Dallagnol, Leandro José

doi:10.1094/pdis-11-18-1981-pdn

Cited by 5 publications

(3 citation statements)

References 4 publications

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“…The pathogen has been previously reported on highbush blueberry in China, Germany, New Zealand, South Africa, South America and United States (e.g. Padamsee & McKenzie, 2019; Pazdiora et al., 2019; Wichura et al., 2020). To our knowledge, this is the first report of P. minimum in the UK and the first time V. myrtillus has been identified as a host.…”

Section: Figurementioning

confidence: 88%

First report of Pucciniastrum minimum (syn. Thekopsora minima) causing leaf rust on Vaccinium corymbosum (blueberry) in the United Kingdom and pathogenicity on Vaccinium myrtillus (bilberry)

Latham

Beal

Clarkson

et al. 2022

New Disease Reports

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Section: Figurementioning

confidence: 88%

First report of Pucciniastrum minimum (syn. Thekopsora minima) causing leaf rust on Vaccinium corymbosum (blueberry) in the United Kingdom and pathogenicity on Vaccinium myrtillus (bilberry)

Latham

Beal

Clarkson

et al. 2022

New Disease Reports

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“…Wichura et al (2020), in their study on the occurrence of T. minima in Lower Saxony in Germany (2015-2016), amplified part of the LSU region by nested PCR, with Rust2inv and LR6 (Aime, 2006) as the first primer set and LR3 (Vilgalys and Hester, 1990) and LR0R (Moncalvo et al, 1995) as the second, which was also used for sequencing the PCR product. Various combinations of primers and protocols for PCR analysis that can be applied for the identification of T. minima are reported in Shands et al (2018), Zheng et al (2017), Pazdiora et al (2018) and Schilder and Miles (2011).…”

Section: Laboratory Testingmentioning

confidence: 99%

“…In South America it has been reported from Colombia (Yepes and Céspedes, 2012), Brazil (Pazdiora et al, 2019) and very recently from Peru (Huarhua et al, 2020).…”

Section: Pest Distributionmentioning

confidence: 99%

Pest survey card on Thekopsora minima

Maier¹,

Wilstermann²,

Delbianco³

et al. 2020

EFS3

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This pest survey card was prepared in the context of the EFSA mandate on plant pest surveillance (M‐2017‐0137) at the request of the European Commission. Its purpose is to guide the Member States in preparing data and information for Thekopsora minima surveys. These are required to design statistically sound and risk‐based pest surveys, in line with current international standards.Thekopsoraminimais not regulated in the EUbut is included in theEPPO A2 list of pests recommended for regulationas a quarantine pest. It is the causal agent of blueberry leaf rust on the American highbush blueberry (Vacciniumcorymbosum). In the EU, the pathogen has been reported in Belgium, Germany, the Netherlands, Portugal and Spain. Host availability seems to be the only limit to the spread of the pest due to its broad climatic tolerance.Surveys should be performed mainly in spring or autumn (in regions with a Mediterranean climate) or late summer and the beginning of autumn (in temperate climates). Detection surveys should mainly target Vaccinium corymbosumin nurseries, plantations and naturalised plants, whereas for delimiting surveys Tsuga and Rhododendron spp.should also be monitored.Surveillance of Thekopsora minima in the EU should focus onthe visible symptoms on Vacciniumplants caused bythe uredinialstage of the fungus that can be identified morphologically by experts. However, reliable identification of T. minima requires molecular methods and DNA sequence analysis.

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Pucciniastrum minimum is the causal agent of blueberry leaf rust on different Vaccinium species in Hawke’s Bay, New Zealand

Chen

Mesarich²,

Kerckhoffs³

et al. 2023

Australasian Plant Pathol.

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Blueberry leaf rust has become a prevalent disease in New Zealand blueberry production. To identify the pathogen responsible for this disease in the Hawke’s Bay region of New Zealand, leaves showing signs or symptoms of rust infection were collected from three blueberry cultivars (‘Centra Blue’ [Rabbiteye], ‘Georgia Dawn’ [Southern Highbush] and ‘Nui’ [Northern Highbush]) and the pathogen subjected to morphological characterization using both scanning electron and bright-field microscopy. Meanwhile, genomic DNA was extracted from urediniospores of infected leaves collected from cultivar ‘Rahi’ (Rabbiteye) and the Internal Transcribed Spacer (ITS) region was sequenced and compared to the corresponding nucleotide sequence of known rust pathogens. Results from both experiments indicated that Pucciniastrum minimum (syn. Thekopsora minima) was the causal agent of blueberry leaf rust disease in Hawke’s Bay. Next, the level of disease caused by P. minimum was quantified on 23 blueberry cultivars in this region during the 2019 blueberry production season. Here, a total of 20 leaves selected from each cultivar were continually monitored, and the lesion area was calculated using ImageJ based on images taken in the field. Based on this analysis, all leaves were found to be infected by the rust pathogen. However, disease intensity, as a function of the ‘area under the disease progress curve’ (AUDPC) value, was found to be different. This suggests that certain cultivars display a lower disease intensity during the harvest season. Further field assessment covering a whole growing cycle will give a better understanding about blueberry leaf rust infection on these cultivars.

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First Report of Blueberry Leaf Rust Caused by Thekopsora minima on Blueberry (Vaccinium corymbosum) in South America

Cited by 5 publications

References 4 publications

First report of Pucciniastrum minimum (syn. Thekopsora minima) causing leaf rust on Vaccinium corymbosum (blueberry) in the United Kingdom and pathogenicity on Vaccinium myrtillus (bilberry)

First report of Pucciniastrum minimum (syn. Thekopsora minima) causing leaf rust on Vaccinium corymbosum (blueberry) in the United Kingdom and pathogenicity on Vaccinium myrtillus (bilberry)

Pest survey card on Thekopsora minima

Pucciniastrum minimum is the causal agent of blueberry leaf rust on different Vaccinium species in Hawke’s Bay, New Zealand

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