In 1969, Mulliner Park Ward, a firm specialising in building car bodies for Rolls-Royce, reported that 40% of the (on average) seven hides per car needed to make leather car seats had to be thrown away on account of blemishes caused by warble flies and barbed wire while the cattle involved were still alive.
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He suggested this cause might be Phosmet, a systemic organophosphate insecticide that was being spread along the spines of intensively farmed cows to eradicate warble fly.