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Cause of Potato Scab. The cause of common potato scab is a bacterium, Streptomyces Scabies, found in the soil. It is most common on light, sandy soils, low in organic matter. Soils that were previously grassland are particularly liable to having the disease. Soils with a high pH (recently limed) provide a better environment for the bacteria.
Editorial Information. Sheep scab is caused by the host-specific mite Psoroptes ovis. Sheep scab can be transmitted by direct contact when sheep are gathered and held tightly together such as during sales or contact with infested scab material on fenceposts or vehicles used for animal transport etc.. Sheep scab mites can survive off the sheep for up to 17 days, survival being longest when the weather is cold and damp. 4. The only treatments that guarantee persistence for longer than 17 days are diazinon (organophosphate) and moxidectin injection.