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A History of the County of Somerset
… much more than they require as food. Among these are the Hop-flea ( Plectroscelis concinna, Marsh.); the Turnip-fly ( … barley, oats and rye, sometimes doing much injury; the Hop Aphis ( Phorodon humuli, Schrank), which in some seasons has greatly ravaged the hop gardens of England; the Turnip Aphis ( Rhopalosiphum …