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He said the main one-generation fly for most cattle farmers to worry about was Hydrotaea irritans, commonly known as the head fly and known to transmit summer mastitis.
Roger Jones, from Cwmbran, eased the stress of moving house by paying a visit to the Tintern fishery and hooking 20 fish on an olive gold head fly while a daddy longlegs pattern was responsible for 15 returned by Steve Rowlands and also 14 caught by Sam Glenn.
The disease appears in the main to be associated with transmission by the sheep head fly (Hydrotea irritans) which can carry Arcanobacterium (Corynebacterium) pyogenes, the main bacteria involved.