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<p>CSV import</p> <p><b>New page</b></p><div>[[File:Sporosori.jpg|thumb|Sporosori]] &#039;&#039;&#039;Powdery scab&#039;&#039;&#039; is a [[plant disease]] that affects [[potato]]es and other members of the [[Solanaceae]] family. It is caused by the pathogen &#039;&#039;[[Spongospora subterranea]]&#039;&#039;, a type of [[plasmodiophorid]].<br /> <br /> ==Symptoms==<br /> The primary symptom of powdery scab is the appearance of raised, pustule-like lesions on the surface of the [[tuber]]s. These lesions eventually burst, releasing a powdery mass of [[spores]]. Infected tubers may also exhibit [[root galls]] and [[stunted growth]]. The disease can significantly reduce the marketability of the crop due to the unsightly appearance of the tubers.<br /> <br /> ==Pathogen==<br /> &#039;&#039;Spongospora subterranea&#039;&#039; is a [[soil-borne pathogen]] that thrives in cool, wet conditions. It is a member of the [[Plasmodiophoromycota]] and is closely related to the pathogen that causes [[clubroot]] in [[cruciferous vegetables]]. The pathogen produces [[resting spores]] that can survive in the soil for many years, making it difficult to eradicate once it has become established in a field.<br /> <br /> ==Life Cycle==<br /> The life cycle of &#039;&#039;Spongospora subterranea&#039;&#039; involves several stages. The resting spores germinate in the presence of a suitable host, releasing [[zoospores]] that infect the roots of the plant. The pathogen then forms a plasmodium within the root cells, which eventually produces new resting spores. These spores are released into the soil when the infected tissue decays, completing the cycle.<br /> <br /> ==Management==<br /> Managing powdery scab involves a combination of cultural practices and, in some cases, chemical treatments. Key strategies include:<br /> <br /> * **Crop rotation**: Avoid planting potatoes or other susceptible crops in the same field for several years.<br /> * **Resistant varieties**: Use potato varieties that are less susceptible to powdery scab.<br /> * **Soil management**: Improve soil drainage and avoid over-irrigation to reduce the conditions that favor the pathogen.<br /> * **Sanitation**: Clean and disinfect equipment and storage facilities to prevent the spread of the pathogen.<br /> <br /> ==Economic Impact==<br /> Powdery scab can have a significant economic impact on potato production. The disease not only reduces yield but also affects the quality of the tubers, leading to lower market prices. In severe cases, entire crops may be deemed unmarketable.<br /> <br /> ==See Also==<br /> * [[Potato diseases]]<br /> * [[Plant pathology]]<br /> * [[Soil-borne diseases]]<br /> <br /> ==References==<br /> {{Reflist}}<br /> <br /> ==External Links==<br /> {{Commons category|Powdery scab}}<br /> <br /> [[Category:Plant diseases]]<br /> [[Category:Potato diseases]]<br /> [[Category:Soil-borne diseases]]<br /> [[Category:Plasmodiophoromycota]]<br /> <br /> {{Plant-disease-stub}}</div>

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