Introduction
Grey-black
hump-backed flies, 5 mm long and found in North and South America that
are external parasites of birds and mammals. The flies transmit
leucocytozoonosis and also a filarial parasite in ducks. The condition
tends to occur near to rapidly flowing streams, although these insects
can travel up to 15 miles. Eggs and larvae survive through the winter to
cause new infestations in the following year.
Signs
- Anaemia in young birds.
- Swarms of flies.
Post-mortem lesions
- Anaemia.
Diagnosis
Anaemia, season, local history.
Treatment
Treatment is difficult.
Prevention
Similar measures as for mosquito control. Biological control using a strain of Bacillus thuringensis has had some success and is preferable to insecticides. Weekly treatments are required.
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