Molecular analyses indicate that both native and exotic pathogen populations serve as sources of novel outbreaks of Cypress Canker Disease

Rocca, Gianni Della; Danti, Roberto; Williams, N.; Eyre, Catherine A.; Garbelotto, Matteo

doi:10.1007/s10530-019-02022-9

Cited by 8 publications

(3 citation statements)

References 65 publications

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“…S. cardinale population in New Zealand includes two distinct genetic groups. An older group was identified in California that likely to be native and could be originally introduced from California before 1933 (Della Rocca et al, 2019). While a more recent group was identified in the Mediterranean region and could be introduced from Europe before 1982 (Della Rocca et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

“…An older group was identified in California that likely to be native and could be originally introduced from California before 1933 (Della Rocca et al, 2019). While a more recent group was identified in the Mediterranean region and could be introduced from Europe before 1982 (Della Rocca et al, 2019). It has been reported that the Californian groups are reproducing clonally and sexually, while the Mediterranean groups are only reproducing clonally (Della Rocca et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

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Genetic Variation for Economically Important Traits in Cupressus lusitanica in New Zealand

et al. 2021

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Increasing productivity and tolerance against cypress canker disease is an important goal in the Mexican white cypress breeding program in New Zealand, and screening has been in place since 1983. Cypress canker disease is caused by Seiridium cardinale and Seiridium cupressi, the current study presents the results of two progeny trials within the breeding program in the North Island of New Zealand. The trials were established as open-pollinated progeny tested and were assessed for diameter at breast height, branch size, canker severity score, malformation score, and stem straightness score and acceptability score. Heritability estimates were moderate ranging from 0.21 to 0.41 for diameter at breast height and from 0.14 to 0.31 for canker severity score. Stem form attributes showed heritability from 0.08 (malformation) to 0.38 (straightness). No trait showed any significant G × E interaction between investigated sites. This was supported by the very strong genetic correlations estimated between the traits recorded in Welcome Bay and Matata trials. Unfavourable genetic correlations ranging from 0.25 to 0.46 were found between diameter at breast height and canker severity score, indicating that the continued selection for genotypes with improved diameter at breast height would also increase susceptibility to cypress canker. Additionally, unfavourable genetic correlations ranging from 0.52 to 0.73 were found between branch size and diameter at breast height and should be considered in selection programs. The moderate heritability estimated for canker severity score indicates that breeding values for this trait could be predicted with acceptable accuracy and included in the breeding program for Cupressus lusitanica, enabling the identification of genotypes with tolerance to canker severity to be deployed to locations where cypress canker is present in New Zealand.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Genetic Variation for Economically Important Traits in Cupressus lusitanica in New Zealand

et al. 2021

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“…The Panel thinks it would be useful to conduct a global survey to characterise the molecular diversity of P. s. subsp. stewartii so as to pinpoint likely pathways of past introductions (invasion history) of the pathogen to regions where it is not endemic, as recently done for other plant pests Rocca et al, 2019). Furthermore, it would be useful to clarify the origin of the seed associated with current outbreaks in Italy and Slovenia.…”

Section: Discussionmentioning

confidence: 99%

Risk assessment of the entry of Pantoea stewartii subsp. stewartii on maize seed imported by the EU from the USA

Bragard¹,

Dehnen‐Schmutz²,

Serio³

et al. 2019

EFS2

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Following a request from the European Commission, the EFSA Panel on Plant Health performed a risk assessment of the entry of Pantoea stewartii subsp. stewartii on maize seed imported by the EU from the USA. This pest is a Gram-negative bacterium which causes Stewart's vascular wilt and leaf blight of maize (including sweet corn), a disease responsible for serious crop losses throughout the world. The following scenarios were considered: scenario A0 (current practice), scenario A1 (US request for modification of EU conditions for derogation), and scenario A2 (EU conditions for derogation). Results from the quantitative seed pathway model presented here show that, despite the low rates of plant-to-seed and seed-toseedling transmission that have been reported in the literature for Stewart's wilt, given the amount of traded seed, and in the case of voluntary (i.e. not mandatory) inspections of seed production fields at the origin (i.e. scenario A0), the frequency of introducing the disease is in the order of magnitude of some hundred introductions per year (median number). The EU conditions for derogation would lead to a decrease in the likelihood of entry compared to scenarios A0 (about 10,000 times fewer introductions) and A1 (about 2,000 times fewer introductions). This protective effect is mainly due to the requirement that only genotypes resistant to Stewart's wilt are traded, with the additional field inspection (two instead of one per season) providing additional reassurance. The Panel also concluded that seed lot inspections, as currently carried out (e.g. with a sample of 400 seeds) are not likely to lead to a relevant reduction in the level of infected imported maize seed, given the low prevalence of Stewart's wilt at the origin. If, however, there is aggregation in infection among consignments, inspection would work towards identifying the highly infected consignments. Recently, outbreaks of Stewart's wilt have occurred in Italy (Emilia Romagna, Friuli, Lombardy and Veneto). A review is provided of the available information to assess the possible role of seed imports in these outbreaks.

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A critical review on bioaerosols—dispersal of crop pathogenic microorganisms and their impact on crop yield

Mohaimin,

Krishnamoorthy,

Shivanand

2023

Braz J Microbiol

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Molecular analyses indicate that both native and exotic pathogen populations serve as sources of novel outbreaks of Cypress Canker Disease

Cited by 8 publications

References 65 publications

Genetic Variation for Economically Important Traits in Cupressus lusitanica in New Zealand

Genetic Variation for Economically Important Traits in Cupressus lusitanica in New Zealand

Risk assessment of the entry of Pantoea stewartii subsp. stewartii on maize seed imported by the EU from the USA

A critical review on bioaerosols—dispersal of crop pathogenic microorganisms and their impact on crop yield

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