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Almanac Pests
Plant pests of current importance (potential or existing risk for the European region)
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Hops without pests & diseases

Hops without pests & diseases | Almanac Pests | Scoop.it
RT @Britishhops: @Jimthebrewer @CharlesFaram For more info about Hop Stunt Viroid and its impact see: http://t.co/Im9nLTDYb1

Hop plants may be cropped for over 20 years, so it important that the original planting is free from debilitating virus and viroid disease (some of them symptomless). Specialist hop propagators, located outside the main hop growing regions, supply certified disease free stock under an official approval scheme.

Knapco's insight:

See news from main UK hop varieties breeder: http://www.britishhops.org.uk/new-hop-varieties/

 

Pest risk analysis of Hop Stunt Viroid

http://www.fera.defra.gov.uk/plants/plantHealth/pestsDiseases/documents/hopStuntViroid.pdf

 

First report of Hop Stunt Viroid in Europe infecting hops in Slovenia

http://dx.doi.org/10.1094/PDIS-08-11-0640-PDN

 

Emergency measures against Hop Stunt Viroid outbreak in  Slovenia

http://www.arhiv.fu.gov.si/en/services_and_measures/regulated_organisms/hop_stunt_viroid/

 

Detection of HLVd and HSVd in hops http://agrofabl.org/wp-content/uploads/2012/10/Ljubljana_Pokorn_Tine.pdf

 

Hop Stunt Viroid Syndrom (pSVd-cucumber pale fruit viroid-like (HpSVd-cuc) + truncated Citrus viroid (CVd IV) in hops

http://www.actahort.org/books/1010/1010_14.htm

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Mild and lethal strains of fungus Verticillium albo-atrum on hops http://onlinelibrary.wiley.com/doi/10.1111/j.1365-2338.2007.01160.x/pdf

 

Lethal strain of Verticillium albo-atrum causing hop wilting - control measures in Slovenia

 http://www.arhiv.fu.gov.si/en/services_and_measures/regulated_organisms/hop_wilt_verticillium_alboatrum_reinke_at_berthold_and_verticillium_dahliae_klebahn/

Resistance research:

http://link.springer.com/article/10.1007%2Fs00122-013-2062-4

 

http://link.springer.com/article/10.1007%2Fs10658-009-9467-6

 

http://www.lfl.bayern.de/mam/cms07/ipz/dateien/hopfen_sc13-proceedings-online-endfassung.pdf

 

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First report of HSVd in Jujube trees in China

First report of HSVd in Jujube trees in China | Almanac Pests | Scoop.it

Hybridization and Biological Indexing Results showed that the 2 Jujube tree samples which were collected from the same field of “Jujube tree-pear” intercroping in Qiqiao,Cangzhou were positive for Hop stunt viroid (HSVd). This is the first report of HSVd in Jujube trees in the world

Both of the 2 samples were selected for cloning, sequence analysis of HSVd and then comparing withthe first HSVd sequence (X00009,1983) from the Hop and also the HSVd sequences in GenBank.

Agricultural Science Research Paper, 132 p

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In Hop Pursuit: Appearance of Hop Stunt Viroid

In Hop Pursuit: Appearance of Hop Stunt Viroid | Almanac Pests | Scoop.it

The Mt. Rainier variety is a fine hop that hasn’t taken off yet. Mt. Rainier was released right after this huge oversupply of hops occurred and there was very little demand for hops--new or old. The production and distribution of Mt. Rainier was also hampered by the appearance of hop stunt viroid in 2008. To make a long story short, it was entered into the Clean Plant Network as soon as possible and if I’m not mistaken, will become available this year for limited distribution of cuttings. 

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A Viroid Resembling Hop Stunt Viroid in Grapevines from Europe, the United States and Japan

A viroid (GV) was isolated from grapevines recently introduced into Japan from France, West Germany, Austria, Hungary and U.S.A., as well as from those cultivated in Japan. It was detected in 28 out of 32 (88%) grapevines tested. The isolates of GV had similar host ranges and induced symptoms in cucumber plants identical to those induced by hop stunt viroid (HSV).

The result indicates that GV is a grapevine isolate of HSV and suggests that grapevines were the source of hop stunt disease in Japan.

Sano et al. (1986) A Viroid Resembling Hop Stunt Viroid in Grapevines from Europe, the United States and Japan.- J Gen Virol August 1986 vol. 67 no. 8 1673-1678

doi: 10.1099/0022-1317-67-8-1673

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Viroids from Citrus and Grapevine Trees

Viroids from Citrus and Grapevine Trees | Almanac Pests | Scoop.it

Viroids are important pathogens of many plants. In citrus trees Citrus exocortis viroid (CEVd) and Citrus viroidâ…¡(CVd-â…¡,known as Hop stunt viroid, HSVd) can cause the dwarf of citrus trees, decrease growth vigor and fruit production. These two viroids also can infect grapevine. However, they usually do not induce any visible symptoms. In this study, the viroids in citrus and grapevine trees grown in China were detected and their molecular characteristics were analysized.

The results showed that 2 samples were infected with CEVd and this was the first report of CEVd from grapevine in China. The infection rate by HSVd was 35%.

Agricultural Science Research Paper, 133 p

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Detection and Sequence Diversity Analysis of Viroids Isolated from ...

Detection and Sequence Diversity Analysis of Viroids Isolated from ... | Almanac Pests | Scoop.it

At present two kinds viroids were reported infected peach. Hop stunt viroid (HSVd) and Peach latent mosaic viroid (PLMVd). PLMVd had been already reported on peach tree of China, but for HSVd this is the first report in peach in China. Photo: PLMVd infected peach.

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Standing Committee on Plant Health, report OCT 2011

Slovenia informed the Committee of their national emergency measures for Hop stunt viroid (HSV). Observation of first symptoms dates back to 2007.

EUROPEAN COMMISSION
HEALTH AND CONSUMERS DIRECTORATE-GENERAL Brussels, SANCO G (2011) 1418728

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Plant Disease - First report of Hop stunt viroid infecting hop in Europe

Plant Disease - First report of Hop stunt viroid infecting hop in Europe | Almanac Pests | Scoop.it

Diseased stunted hop plants occure along the row (S. Radisek, 2011)


Hop stunt viroid (HSVd) infection has been observed in several hop fields (Humulus lupulus) with the varieties Celeia, Bobek and Aurora, in Slovenia in last years, but it has been only recently confirmed by two laboratories.

The symptoms included stunting, leaf curl, small cone formation and dry root rot. In the first year of finding the disease, the incidence varied from 1-30% and increased rapidly (by up to 10%) each subsequent year, predominantly along plant rows.

Using molecular methods labs finnaly identified HSVd, which belongs to the Hostuviroid genus, Pospiviroidae family and has been previously reported in hops in Japan, South Korea, North America and China.

This is the first report of the detection of HSVd on hops in Europe. Strict phytosanitary measures have been taken to prevent further spread and to eradicate HSVd infections.

Radisek et al. (2012) First report of Hop stunt viroid infecting hop in Slovenia.- Plant Disease 
http://dx.doi.org/10.1094/PDIS-08-11-0640-PDN

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