00526naa a2200133 a 450000100080000000500110000800800410001910000160006024501960007626000090027270000170028170000150029877300790031318309142010-01-10       1981    bl ---       0--  u    #d1 aDEAN, G. J.  aThe relative abundance of the hymenopterous parasites attacking Metopolophium dirhodum (Walker) and Sitobion avenae (F.) (Hemiptera aphididae) on cereals during 1973-1979 in southern England.  c19811 aJONES, M. G.1 aPOWELL, W.  tBulletin of Entomological Research, Londongv. 71, n. 2, p. 307-315, 1981.