The scab of potatoes is another case in point.
- Outbreaks of Sheep-Scab in Great Britain, 1877-1905.
A practitioner took a scab from someone with a mild case, made an incision in the skin of a healthy person, and infected that person with the scab.
Sheep-scab is a loathsome skin disease due to an acarian parasite.
She had a scab on her forehead over her left eye and a bruise on her cheek.
C. 70) revoked all former acts, and defined disease to mean cattle plague, pleuro-pneumonia, foot-and-mouth disease, sheep-pox, sheep-scab and glanders, together with any disease which the Privy Council might by order specify.
Similar spraying is recom- (From a specimen in the British Museum.) mended for pear-leaf blister Pear Scab (Fusicladium pyrinum).
Pear scab is caused by a parasitic fungus, Fusicladium pyrinum, very closely allied and perhaps merely a form of the apple scab fungus, F.
The fungus, Sorosporium scabies, which is the cause of the scab, does not penetrate into the flesh of the tuber, nor detract from its edible properties.
It is compulsory on owners to notify the authorities as to the existence of scab amongst their sheep. By the Diseases of Animals Act (1903) powers to prescribe the dipping of sheep, irrespective of the presence or otherwise of sheep scab, were conferred upon the Board of Agriculture.
A Scab Act is in force, and is stringently carried out by government inspectors with most satisfactory results.
The tubers frequently show scurfy or scab-like spots upon their surface, thus greatly depreciating their value for market purposes.
These become brown, finally blackish and greatly contorted until a large scab is formed on the developing tuber, whence the name by which the disease is known - "black scab."