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713 bytes added ,  21:57, 2 November 2008
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*Also known as the 'head fly'
 
*Also known as the 'head fly'
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*''Hydrotaea irritans'' the main species of veterinary importance
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*Mainly a problem of sheep
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**In some areas is the most numerous fly of cattle and horses
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'''Recognition'''
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*Similar to ''Musca'' spp.
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*Olive green abdomen
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'''Life Cycle'''
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*Eggs laid in decaying vegetation, faeces and in carrion (in the summer months)
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*Emerging larvae overwinter and pupate in spring
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*Adult flies emerge in the summer
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*One generation per year
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'''Pathogenesis'''
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*Cattle:
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**Head flies may transmit summer mastitis
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*Sheep:
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**Extreme irritation
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***Mouthparts rasp the skin to feed on secretions and exudate
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**Self-inflicted damage
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***E.g. 'Broken Head'
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**Secondary bacterial infection may occur
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**Blowfly strike may follow
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