Powdery scab

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Powdery scab
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Chocolate spot on broad bean leaves
Scientific Classification
Domain: Eukaryota
Kingdom: Rhizaria
Phylum: Cercozoa
Subphylum: Endomyxa
Class: Phytomyxea
Genus: Spongospora
Species: Spongospora subterranea

Powdery scab, is a disease that occurs in potato tubers, caused by the protozoa Spongospora subterranea.

Symptoms[edit | edit source]

Symptoms 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[edit | edit source]

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