Global genetics and invasion history of the potato powdery. These can eventually rupture within the tuber periderm. Host resistance represents an economically suitable and long term approach for the management of the disease. Powdery scab is caused by the soilborne slime mold, spongospora subterraneaf. Final report impacts of pasteurisation and mesophilic ad. Cookies are small text files that contain a string of characters and uniquely identifies a browser.
The disease is caused by spongospora subterranea which is. At various stages of development, powdery scab can be mistaken for common scab, potato wart, black scurf, and rootknot nematode damage. Duncan, scottish crop research institute, invergowrie, dundee dd2 5da, scotland, uk introduction powdery scab, caused by spongospora subterranea f. We do not use these to store personal information about you.
Key events in pathogenesis of spongospora diseases in. Powdery scab is caused by a soilborne obligate fungus, spongospora subterranea, which forms superficial lesions on the tuber surface and galls on roots and. Pdf powdery scab, a root and tuber disease caused by the pathogen spongospora subterranea f. Yield loss common scab does not normally affect total yield but often significantly affects tuber appearance, reducing marketable yield. Validation of quantitative realtime qpcr for quantifying spongospora subterranea ss sporosori per gram of soil in either a single a, c, e, and g or a duplex b, d, f, and h qpcr along with. Powdery scab effect on the potato solanum tuberosum ssp. The relationship between initial soil inoculum level of spongospora subterranea f. Documents about spongospora subterranea sponsu this website uses cookies our website uses cookies to ensure that we give you the best possible online experience. Spongospora subterranea sponsudocuments eppo global. Spongospora subterranea is a biotrophic pathogen that has a biphasic life.
Global genetics and invasion history of the potato powdery scab. Agronomic factors affect powdery scab of potato and. Continuing to use this website means you agree to our use of cookies. Skin lesions caused by spongospora subterranea on potato tubers. It results in lesions scabs on the 26 surface of tubers that are filled with a brown powder consisting of sporosori 27 also referred to as sporeballs, hence the common name harrison et al. Click the upload files button and select up to 20 html files or zip archives containing html, images and stylesheets. Detection and quantification of spongospora subterranea sporosori. Losses to the australian potato processing industries are.
Instantly convert html files to pdf format with this free online converter. Detection and quantification of spongospora subterranea f. Potato spongospora subterranea powdery scab ephytia. Final report impacts of pasteurisation and mesophilic ad on some common crop pests and diseases in the uk the susceptibilities of a number of common agricultural pests and diseases including blackgrass, clubroot and late blight to pasteurisation andor mesophilic anaerobic digestion were. Symptoms of powdery scab include small lesions in the early stages of the disease, progressing to raised pustules containing a powdery mass. Monitoring spongospora subterranea development in potato. Classification of fungi alexopoulos and mims 1979 pdf 79 download. Ueli merz, insitute of plant sciences, zurich, switzerland genetic resistance relatively little is known about resistance of potato to powdery scab. Bulman sr and marshall jw 1998 detection of spongospora subterranea in potato. Potato cultivars that are susceptible to the disease present spongelike galls on the roots and stolons fig, and scabby lesions on the tubers fig. Although these methods work well in a research format, where. Classification of fungi alexopoulos and mims 1979 pdf 79.
Though this disease can reduce yield somewhat, the true economic effect is due to the unmarketable, scabbed appearance figure 1 as well as rejection of tubers as seed to prevent infestation of clean fields. Pdf detection and eradication of spongospora subterranea in. Three field experiments were conducted in naturally infested soil during winter 2008, 2012 and 20 to evaluate the efficacy of soil fumigation on powdery scab on tubers, root galling and the pathogen populations in. Subterranea is the cercozoan that causes a blemish potato diseasecalledpowderyscab,affectingthepotatotubers. Potato powdery scab pps caused by spongospora subterranea wallr. Analysis of carbohydrate metabolism genes of spongospora.
Powdery scab spongospora subterranea of potatoes by melhus, i. Lahuf, louise sullivan, alison lees, lesley torrance, alison roberts. Spongospora subterranea is also thevectorofthepotato moptop virus, another economically important pathogen of potato kirk 2008. Root infection of potato by spongospora subterranea. Investigating factors affecting infection of potato by. Iftikhar et al characterization of spongospora subterranea f sp subterranea root hair and epidermal cells of roots under a stereomicroscope with 20fold magnificatiarn rating of root infection done on 04 scale of marz 1989, vvhsre 0 no sporangia, 1 only a fevv sporangia, several roots with sporangia, 3 sporangia regularly. Identification sources of resistance to potato moptop virus and its vector spongospora subterranea author adnan a. General information about spongospora subterranea sponsu eppo global database. Transactions of the british mycological society, 41.
Gudmestad1, 1 department of plant pathology, north dakota state university, fargo, nd 58108 2 bioagricultural sciences and pest management, colorado state university. Sixteen potato cultivars, with different levels of susceptibility to disease on roots and tubers, were planted in. Itisclassifiedasbeingpartofthe plasmodiophoridgroupoforganisms. Powdery scab, caused by spongospora subterranea, causes significant economic damage in potato production worldwide due to reduced quality and marketability of seed and ware tubers.
Alternative hosts of spongospora subterranea may allow multiplication and survival of the pathogen over time. Data extracted from historic documents, provided by international potato center. Spongospora subterranea causes root galls and powdery scab on potato tubers solanum tuberosum l. Detection and quantification of spongospora subterranea. Once established in fields, the virus can survive in the fungus for up to 20 years in soil in the absence of a potato crop. They are sent to a computer by website operators or third parties. Analysis of carbohydrate metabolism genes of spongospora subterranea using 454 pyrosequencing. Symptoms on tubers affect directly the quality and marketability of the harvested product while infection in roots are associated with yield reductions. Powdery scab of potato, caused by the plasmodiophorid pathogen spongospora subterranea f. Vegetable crop update university of wisconsin nutrient. Pdf spongospora subterranea soil contamination and its. Weeds and rotational crops, such as wheat and barley, were sampled from potato fields with a history of powdery scab ps and examined for the presence of s.
Potato disease pcr testing services csu plant diagnostic clinic let us know what you need. Control of potato powdery scab spongospora subterranea. In each case, a soil sample was taken from the field before planting and assessed for s. Spongospora subterranea, the causal agent of potato powdery scab, is an important soilborne obligate protozoan commonly found in andean soils. The biotroph protozoan spongospora subterranea causes root gall formation and powdery scab on potato. The infection of the potato plant can be either directly from the infected mother tuber or through a. Egan, department of environmental resource management, national university of ireland, belfield, dublin 4, ireland introduction the plasmodiophorid spongospora subterranea f. Seedtuber transmission of spongospora subterranea scielo. Rearrange individual pages or entire files in the desired order. Most browsers are initially set up to accept cookies, since this is required by most website owners in order to access their sites. Merge pdf files combine pdfs in the order you want with the easiest pdf merger available. Subterranea is the cercozoan that causes a blemish potato disease called powdery scab, affecting the potato tubers.
The effect of spongospora subterranea soil inoculum levels. In all experiments soil inoculum level of sss sporeballs. Spongospora subterranea is the causal agent of powdery scab on potato. Ndsu workshop, june 2017 powdery scab spongospora subterranea. It is caused by the cercozoan spongospora subterranea f. Pdf we investigated soil contamination by spongospora subterranea f. Knowledge of global genetic diversity and population structure of pathogens is essential for disease management including resistance breeding. This is a serious problem that causes cosmetic damage on the skin of tubers and induces root gall formation, diminishing the yield and commercial value of.
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