A Survey of the Incidence of Potato Spindle Tuber Viroid in Prince Edward Island Using Two Testing Methods

Singh, R. P.; DeHaan, T. L.; Jaswal, A. S.

doi:10.4141/cjps88-152

Cited by 17 publications

(4 citation statements)

References 4 publications

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“…Therefore, uncertainty exists on geographical distribution and prevalence of pospiviroids. For example, after initial reports and application of stringent regulations, PSTVd was eradicated from potato stocks in several countries (Singh and Crowley, 1985;Singh et al, 1988;De Boer et al, 2002;Sun et al, 2004;De Boer and Dehaan, 2005), nevertheless the state of PSTVd in other asymptomatic host plants in those countries is not known.…”

Section: Taxonomic Position Detection and Identification Methodsmentioning

confidence: 99%

Scientific Opinion on the assessment of the risk of solanaceous pospiviroids for the EU territory and the identification and evaluation of risk management options

2011

EFSA Journal

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Following a request from the EU Commission, the EFSA PLH Panel conducted a risk assessment for the EU territory of pospiviroids affecting solanaceous crops, identified and evaluated risk reduction options and evaluated the EU provisional emergency measures targeting Potato spindle tuber viroid (PSTVd). The risk assessment included PSTVd, Citrus exocortis viroid, Columnea latent viroid, Mexican papita viroid, Tomato apical stunt viroid, Tomato chlorotic dwarf viroid, Tomato planta macho viroid, Chrysanthemum stunt viroid and Pepper chat fruit viroid. Four entry pathways were identified, three involving plant propagation material, with moderate probability of entry, and one involving plant products for human consumption, with low probability of entry. The probability of establishment was considered very high. Spread was considered likely within a crop and moderately likely between crop species, with exception of spread to potato, rated as unlikely. The probability of long distance spread within vegetatively propagated crops was estimated as likely/very likely. The direct consequences were expected to be major in potato and tomato, moderate in pepper, minimal/minor in other vegetables and minimal in ornamentals. Main risk assessment uncertainties derive from limited knowledge on pospiviroids other than PSTVd, although all pospiviroids are expected to have similar biological properties. Management options to reduce risk of entry, spread and consequences were identified and evaluated. No management options can prevent establishment. Examples of successful PSTVd eradication are linked to timely and strict implementation of measures. Uncertainty exists on the effectiveness of risk reduction strategies targeting only one pathway. The EU provisional emergency measures appeared to have significantly reduced PSTVd incidence in Solanum jasminoides and Brugmansia sp., even though eradication from the EU is so far incomplete. The low PSTVd incidence in food crops did not permit to conclude whether the reduction in PSTVd prevalence in ornamentals led to a reduction in outbreaks in food crops.

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Section: Taxonomic Position Detection and Identification Methodsmentioning

confidence: 99%

Scientific Opinion on the assessment of the risk of solanaceous pospiviroids for the EU territory and the identification and evaluation of risk management options

2011

EFSA Journal

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“…Surveys for PSTVd in Prince Edward Island and elsewhere have shown that the disease has now been virtually eliminated from Canada (Singh et al 1988b).…”

Section: Tuber-borne Diseasesmentioning

confidence: 99%

The role of plant pathology research in the Canadian potato industry

Boer

1994

Canadian Journal of Plant Pathology

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“…(3) Requirement of viroid-testing of all parental material prior to their use in potato-breeding programs and (4) Viroid-freedom of the new cultivars before their release to potato seed growers. As a result PSTVd was eradicated from potato crops in Canada [64,70] ( Fig. 5).…”

Section: Eradication Of Pstvd From Canadamentioning

confidence: 99%

The discovery and eradication of potato spindle tuber viroid in Canada

Singh

2014

VirusDis.

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In 1960s, potato spindle tuber was thought to be a viral disease. In 1971, the agent of the disease was characterised as a low-molecular weight infectious ribonucleic acid (RNA), which was named as 'viroid', specifically Potato spindle tuber viroid (PSTVd)). Since then, more than 30 plant diseases in horticultural and ornamental plants have been shown to be caused by different viroids globally. Viroids are single-stranded RNA, covalently closed circular molecule, without any protein coat. They are the smallest known plant pathogen containing RNA genome ranging from 246 nucleotides (Coconut cadang-cadang viroid) to 399 nucleotides (Chrysanthemum chlorotic mottle viroid). Some viroids are located in the plant cell nucleus (pospiviroids) and others in the chloroplast (avsunviroids). With the recognition of pathogenic nature of viroid, specific detection methodologies were developed, which enabled detection of PSTVd in seed-potato tubers prior to their planting in the field, and thus PSTVd was prevented from spreading the disease. As a result, PSTVd was eradicated from Canada in late 1980s. Viroids similar to PSTVd (Pospiviroid) have been discovered and they are detected in symptomless ornamental plants. Although, PSTVd has been eradicated from Canada, there is a strong possibility of viroid introduction from other plants besides potato and tomato and causing PSTVd like diseases.

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A Survey of the Incidence of Potato Spindle Tuber Viroid in Prince Edward Island Using Two Testing Methods

Cited by 17 publications

References 4 publications

Scientific Opinion on the assessment of the risk of solanaceous pospiviroids for the EU territory and the identification and evaluation of risk management options

Scientific Opinion on the assessment of the risk of solanaceous pospiviroids for the EU territory and the identification and evaluation of risk management options

The role of plant pathology research in the Canadian potato industry

The discovery and eradication of potato spindle tuber viroid in Canada

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