Abstract
SUMMARY Bovine oesophagi and spinal canals were examined for first instar larvae of Hypoderma lineatum and H. bovis, respectively. Larvae of H. lineatum were found only within the period September to March, and mainly in November, December and January. A maximum monthly infection of 14.3 per cent was recorded. Up to 52 per cent of apparently infected spinal canals contained larvae of H. bovis. It is suggested that the majority of the warble infections seen in cattle in the south-east of England may be due to H. bovis, and that the weather during the summer of one year probably has a significant effect on the warble infection in the following year. Average warble infections in hides from all parts of England and Wales fell from 31.5 per cent in i960 to 18.9 per cent in 1964.
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