Hop stunt viroid

{{Short description|Species of virus}}

{{Virusbox

| parent = Hostuviroid

| species = Hop stunt viroid

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The hop stunt viroid (abbreviated HSVd, binomial name Hostuviroid impedihumuli) is a viroid species that infects the common hop plant,{{cite web|url=http://www.ipmimages.org/browse/detail.cfm?imgnum=5393349|title=hop stunt viroid (HSVd) (Hostuviroid HSVd )|date=23 June 2009|website=IPM Images|access-date=31 December 2018}} citrus plants, grapevines, cucumber, and several Prunus species such as almond, apricot, plum, and peach.{{Cite journal |last1=Jo |first1=Yeonhwa |last2=Chu |first2=Hyosub |last3=Kim |first3=Hangil |last4=Cho |first4=Jin Kyong |last5=Lian |first5=Sen |last6=Choi |first6=Hoseong |last7=Kim |first7=Sang-Min |last8=Kim |first8=Sun-Lim |last9=Lee |first9=Bong Choon |last10=Cho |first10=Won Kyong |date=May 2017 |title=Comprehensive analysis of genomic variation of Hop stunt viroid |url=http://link.springer.com/10.1007/s10658-016-1075-7 |journal=European Journal of Plant Pathology |language=en |volume=148 |issue=1 |pages=119–127 |doi=10.1007/s10658-016-1075-7 |s2cid=22949821 |issn=0929-1873}}{{cite web |last=Kofalvi |date=1997 |title=Hop stunt viroid (HSVd) sequence variants from Prunus species: evidence for recombination between HSVd isolates. J Gen Virol 78 (12): 3177 |url=http://vir.sgmjournals.org/cgi/content/abstract/78/12/3177 |url-status=dead |archive-url=https://web.archive.org/web/20030719182610/http://vir.sgmjournals.org/cgi/content/abstract/78/12/3177 |archive-date=2003-07-19 |website=vir.sgmjournals.org}} It is asymptomatic or latent in most host plants, but in some hosts it can cause stunting and other symptoms. A study of HSVd-infected hops in the USA showed that the severity of yield reduction was highly dependent on the infected hop cultivar.{{Cite journal |last1=Kappagantu |first1=Madhu |last2=Nelson |first2=Mark E. |last3=Bullock |first3=Jeff M. |last4=Kenny |first4=Stephen T. |last5=Eastwell |first5=Kenneth C. |date=April 2017 |title=Hop Stunt Viroid : Effects on Vegetative Growth and Yield of Hop Cultivars, and Its Distribution in Central Washington State |journal=Plant Disease |language=en |volume=101 |issue=4 |pages=607–612 |doi=10.1094/PDIS-06-16-0884-RE |pmid=30677365 |issn=0191-2917|doi-access=free }}

HSVd is a member of the Pospiviroidae family and the Hostuviroid genus. There are various different sub-species of the hop stunt viroid.