Powdery scab

Powdery scab
Sporosori (survival structure) of the powdery scab pathogen
Sporosori (survival structure) of the powdery scab pathogen
Scientific classification
(unranked):
SAR
(unranked):
Rhizaria
Phylum:
Cercozoa
Class:
Phytomyxea
Order:
Plasmodiophorida
Family:
Plasmodiophoraceae
Genus:
Spongospora
Species:
Spongospora subterranea
Trinomial name
Spongospora subterranea f. sp. subterranea

Powdery scab is a disease of potato tubers.[1] It is caused by the cercozoan Spongospora subterranea f. sp. subterranea and is widespread in potato growing countries.[2][3] Symptoms of powdery scab include small lesions in the early stages of the disease, progressing to raised pustules containing a powdery mass. These can eventually rupture within the tuber periderm.[4] The powdery pustules contain resting spores that release anisokont zoospores (asexual spore with two unequal length flagella) to infect the root hairs of potatoes or tomatoes.[5] Powdery scab is a cosmetic defect on tubers, which can result in the rejection of these potatoes. Potatoes which have been infected can be peeled to remove the infected skin and the remaining inside of the potato can be cooked and eaten.[6]

  1. ^ "Resistance to Powdery Scab in Potatoes" (PDF). USDA/ARS. Retrieved 2015-11-11.
  2. ^ "Potato scabs/RHS Gardening". www.rhs.org.uk. Retrieved 2015-11-11.
  3. ^ Schwelm A, Badstöber J, Bulman S, Desoignies N, Etemadi M, Falloon RE, Gachon CM, Legreve A, Lukeš J, Merz U, Nenarokova A, Strittmatter M, Sullivan BK, Neuhauser S (April 2018). "Not in your usual Top 10: protists that infect plants and algae". Molecular Plant Pathology. 19 (4): 1029–1044. doi:10.1111/mpp.12580. PMC 5772912. PMID 29024322.
  4. ^ Maldonado, M. Loreto Hernandez, Richard E. Falloon, Ruth C. Butler, Anthony J. Conner, and Simon R. Bulman. "Resistance to Spongospora Subterranea Induced in Potato by the Elicitor β-aminobutyric Acid." Australasian Plant Pathol. Australasian Plant Pathology 44.4 (2015): 445-53. Web. 21 Oct. 2015.
  5. ^ "Bulletin #2436, Powdery Scab of Potatoes | Cooperative Extension Publications | University of Maine". umaine.edu. Retrieved 2015-11-11.
  6. ^ Dennis A. Johnson and Thomas F. Cummings. Effect of Powdery Scab Root Galls on Yield of Potato. (2015).Plant Disease 99:10, 1396-1403