First Report of Leaf Rust on Southern Highbush Blueberry caused by <i>Thekopsora minima</i> in California

Shands, A. C.; Crandall, Sharifa G.; Ho, T. H.; Miles, Timothy D.

doi:10.1094/pdis-09-17-1439-pdn

Cited by 5 publications

(5 citation statements)

References 4 publications

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“…Urediniospores developed on the lower surface of older leaves as yellow-orange pustules within 10 to 14 d of infection and abundant sporulation across the lower leaf surface was observed. The disease symptoms displayed by these accessions were similar to the ones described in previous leaf rust reports (Barrau et al, 2002;Dal Bello and Perello, 1998;Keith et al, 2008;McTaggart et al, 2013;Mostert et al, 2010;Rebollar-Alviter et al, 2011;Shands et al, 2018;Wiseman et al, 2016;Zheng et al, 2017).…”

Section: Resultssupporting

confidence: 87%

“…3 and 4). Spore sizes and morphology were congruent with T. minima described previously (Keith et al, 2008;Shands et al, 2018;Wiseman et al, 2016).…”

Section: Resultssupporting

confidence: 83%

“…This may reduce plant vigor and lead to poor fruit production. The incidence of the disease has been increasing in the United States, where the pathogen has been reported in several states, including Delaware, New York, Michigan, Oregon, Hawaii, California, and Georgia (Keith et al, 2008;Sato et al, 1993;Shands et al, 2018;Wiseman et al, 2016). In addition, leaf rust has been reported in many countries, including South Africa, Mexico, Spain, Argentina, Australia, and China (Barrau et al, 2002;Dal Bello and Perello, 1998;McTaggart et al, 2013;Mostert et al, 2010;Rebollar-Alviter et al, 2011;Zheng et al, 2017).…”

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confidence: 99%

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Reaction of Different Vaccinium Species to the Blueberry Leaf Rust Pathogen Thekopsora minima

Babiker¹,

Stringer²,

Smith³

et al. 2018

horts

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Blueberry leaf rust caused by Thekopsora minima is a serious threat to blueberry production. To investigate the host range and characterize new sources of resistance, 15 southern highbush accessions (Vaccinium corymbosum), two interspecific hybrids (V. elliottii × V. pallidum and V. corymbosum × V. pallidum), and accessions from five diploid Vaccinium species were inoculated with an isolate of T. minima. Of 15, only two southern highbush accessions displayed resistance, whereas both accessions of V. arboreum displayed immunity against T. minima. Accessions of V. darrowii exhibited necrosis but with limited sporulation, indicating a high level of resistance. Sporulating lesions and brown spots were observed in accessions of V. elliottii and V. tenellum. Brown lesions, large pustules, and abundant sporulation were observed on V. pallidum accessions and their interspecific hybrids. As the lesions expanded, defoliation was observed in V. pallidum accessions. When tested against rabbiteye (V. virgatum) and southern highbush blueberries, urediniospores of T. minima from overwintering leaves of V. pallidum were found to be virulent, suggesting that T. minima overwinters on V. pallidum. Based on symptoms and scanning electron microscopy (SEM) of urediniospores, we hypothesize that V. elliottii, V. tenellum, V. pallidum, and V. corymbosum exhibit no host specificity to T. minima.

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Section: Resultssupporting

confidence: 87%

“…3 and 4). Spore sizes and morphology were congruent with T. minima described previously (Keith et al, 2008;Shands et al, 2018;Wiseman et al, 2016).…”

Section: Resultssupporting

confidence: 83%

mentioning

confidence: 99%

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Reaction of Different Vaccinium Species to the Blueberry Leaf Rust Pathogen Thekopsora minima

Babiker¹,

Stringer²,

Smith³

et al. 2018

horts

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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%

“…It is present in eastern parts of Central and North America, (Schilder and Miles 2011), on the west coast of the USA (Wiseman et al, 2016;Shands et al, 2018) and also in Mexico (Rebollar-Alviter et al, 2011).…”

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 Leaf Rust on Southern Highbush Blueberry caused by Thekopsora minima in California

Cited by 5 publications

References 4 publications

Reaction of Different Vaccinium Species to the Blueberry Leaf Rust Pathogen Thekopsora minima

Reaction of Different Vaccinium Species to the Blueberry Leaf Rust Pathogen Thekopsora minima

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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