Abstract

Summary. Various putrefying substances attract Ludlia sericata to oviposit on sheep in the field. Other blowflies do not respond. Excreta of Ludlia larvae are extremely attractive; faeces from scouring sheep, stale urine and bacterial cultures are also effective. Ludlia does not oviposit on these substances unless they are placed close to the skin of a live sheep; neither sheep skin, wool, nor other live animals can take the place of sheep. The attraction is not due to chemical or bacterial changes in the fleece, since actual contact with the skin or wool is not necessary. It is therefore concluded that the sheep itself plays an essential part in attracting Ludlia. The natural odour may be responsible. These results are discussed in relation to the origin and control of sheep strike.

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