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2024-04-20T22:24:00.0000000Z
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POTATO SPINDLE TUBER VIROID - VIET NAM: FIRST REPORT

ProMED
http://www.promedmail.org

Source: European and Mediterranean Plant Protection Organisation
(EPPO) Reporting Service 03/2024/049 [summ. Mod.DHA, edited]
https://gd.eppo.int/reporting/article-7799

_Potato spindle tuber viroid_ (_Pospiviroid_, PSTVd - EPPO A2 List) is
first reported from Viet Nam. It was detected in 2022 during an export
inspection in seeds of _Capsicum annuum_ produced in Viet Nam.
--
Communicated by:
ProMED

[_Potato spindle tuber viroid_ (PSTVd; type member of genus
_Pospiviroid_) is an important pathogen of solanaceous crops. Yield
losses can be up to 65% in potato and up to 50% in tomato. Symptoms in
potato may include spindly shoots, stunting of plants, severely
distorted tubers (spindles), and delayed sprouting. In tomatoes,
symptoms include leaf chlorosis and distortion, shortening of
internodes, stunting of plants, and absence of flowers. Capsicum
plants often display only mild symptoms. Solanaceous ornamentals and
weeds are often symptomless and may serve as pathogen reservoirs for
crop infections. All varieties of tomato and potato appear to be
susceptible, but mild strains causing latent infections in some host
cultivars exist.

PSTVd is transmitted by true seed in potato and tomato at a rate of up
to 100%, depending on the host cultivar. Tomato seed is considered an
international quarantine risk (ProMED post
http://promedmail.org/post/20140122.2222560). Spread occurs also via
infected plants or vegetative plant parts, pollen, mechanical means,
and plant-to-plant contact. PSTVd is exceptionally stable and can
persist in dried sap or plant residue for a considerable amount of
time. Due to the multiple potential transmission routes and the large
number of host species, both epidemiology and control of PSTVd are
complicated.

Pictures
PSTVd symptoms on potato:
https://www.agric.wa.gov.au/sites/gateway/files/PSTVd%20on%20Atlantic.JPG
and
http://www.dpi.nsw.gov.au/__data/assets/image/0003/583842/above-ground-symptoms-of-infected-potato.jpg
(compared to healthy)
PSTVd symptoms on tomato:
http://www.forestryimages.org/images/768x512/0162082.jpg and
https://www.agric.wa.gov.au/sites/gateway/files/PSTVd%20on%20Rutgers.JPG
(compared to healthy)
Photo galleries of PSTVd symptoms on potato and tomato:
http://www.forestryimages.org/browse/subimages.cfm?SUB=11936 and
https://gd.eppo.int/taxon/PSTVD0/photos
Symptoms of pospiviroids on different hosts:
https://www.ipmimages.org/search/action.cfm?q=pospiviroid

Links
Source publication:
https://doi.org/10.1007/s10327-024-01170-8
Information on PSTVd:
https://gd.eppo.int/taxon/PSTVD0,
https://doi.org/10.1079/cabicompendium.43659,
https://www.agric.wa.gov.au/potatoes/potato-spindle-tuber-viroid and
via
http://www.apsnet.org/publications/apsnetfeatures/Pages/Viroids.aspx
Seed transmission of PSTVd (and some other viroids):
https://doi.org/10.1007/s10658-016-0868-z
Detection methods and quarantine risk analysis of pospiviroids:
https://doi.org/10.2903/j.efsa.2011.2330 and
https://gd.eppo.int/download/standard/258/pm9-013-1-en.pdf
PSTVd taxonomy via:
https://ictv.global/taxonomy
EPPO A2 quarantine list:
https://www.eppo.int/ACTIVITIES/plant_quarantine/A2_list
- Mod.DHA]

Potato
Spindle_tuber_viroid

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