History, biology and control of sheep scab.
Sheep scab is one of the oldest known diseases of sheep. It is caused by either of the mange mites Psoroptes ovis (Fig. 1 and cover) or Sarcoptes scabiei. P. ovis causes irritation so intense that sheep become preoccupied with scratching, cease to feed and rapidly become emaciated. It should be eradicated on welfare grounds alone (Fig. 2).
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Ministry of Agriculture, Fisheries and Food Central Veterinary Laboratory Weybridge Surrey KT15 3NB, UK.