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Acarus Acarus siro aphids author or authors Biol Brown & Jones Brown Podzolic cabbage root fly cent Cheyletus eruditus Schrank County County Fermanagh densities Dieldrin disease Dominance and frequency Donegal Oat Soils dust and debris fauna fish flax fluoride Fusarium Gley Glycyphagus destructor Schrank grain graminis group of authors herbicides horizon Howardstown increased infective unit infested samples Influent Irish ironpan lakes letters line blocks loam Lough Lough Arrow Lough Ennell Lough Mask Lough Sheelin materials medal mesh Mossop Northern Ireland numbers Obverse occurred Peaty percentage pest Pigmy Mangel Beetle plants Plate Podzols Price 30p Price 75p Proc published reclamation recorded reference reproduction as line residues ROYAL DUBLIN SOCIETY samples examined section paper seed South Tipperary species of mites spillages spraying stage of growth sugar beet survey synopsis T. F. Finch Table Tarsonemidae total mite population Tyrophagus Vulpes weed control Weichsel wheat yield