Powdery scab

Taxobox
name = Powdery scab
regnum = Rhizaria
phylum = Cercozoa
classis = Phytomyxea
genus = "Spongospora"
species = "S. subterranea"
binomial = "Spongospora subterranea"

Powdery scab, is a disease that happens to tubers. It is caused by the protozoa "Spongospora subterranea", is widespread in potato growing countries. Symptoms of powdery scab include small lesions in the early stages of the disease, progressing to raised pustules containing a powdery mass. Powdery scab has a cosmetic effect on tubers, which can result in rejection of potatoes. The powdery pustules contain resting spores, which release anisokont zoospores which can infect the root hairs of potatoes or tomatoes.

References

*cite news | first= | last=University of Maine | coauthors= | title=Powdery Scab of Potatoes | date= | publisher= | url =http://www.umext.maine.edu/onlinepubs/htmpubs/2436.htm | work = | pages = | accessdate = | language =
*cite news | first= | last=The Royal Horticultural Society | coauthors= | title=Powdery scab of potatoes (Spongospora subterranea f. sp. subterranea) | date= | publisher= | url =http://www.rhs.org.uk/advice/profiles0802/powdery_scab.asp | work = | pages = | accessdate = 2007-05-06 | language = Webster, John and Weber, Roland, W.S. Introduction to Fungi 3rd edition. Cambridge: Cambridge University Press. 2007.

External links

*cite news | first= | last=Cornell University | coauthors= | title=Powdery scab photos | date= | publisher= | url =http://vegetablemdonline.ppath.cornell.edu/PhotoPages/Impt_Diseases/Potato/Pot_Powdery.htm | work = | pages = | accessdate = | language =
*cite web|url=http://www.ars.usda.gov/SP2UserFiles/Place/53540000/Publications/PotatoProgress/PROSSER-BROWNPOTATOPROGRESSOCTO07.pdf |title=Resistance to Powdery Scab in Potato |format=PDF |work=US Department of Agriculture