Acta Phytopathologica et Entomoligica 25. (1990)

1-4. szám

CONTENTS List of Participants 9 PREFACE 15 Fritz P. Müller 1913-1989 , 17 Albert Pintera 1929-1989 35 Plenary address Evolutionary aspects of parthenogenetic reproduction in aphids A.F.G. DIXON 41 ECOLOGY Biennal galls of the aphid Astegopteryx styraci on a temperate deciduous tree, Styrax obassia S. AOKI AND U. KUROSU 57 Notes on the biology and ecology of Diphyllaphis mordvilkoi /Aizenberg/, the oak wolly aphid, in central Italy A. BINAZZI AND P.F.ROVERSI 67 Resistance of endophyte-infected plants of tall fescue and perennial ryegrass to Diuraphis noxia /Mordvilko/ S.L.CLEMENT, K.S.PIKE,W.J.KAISER AND A.D. WILSON 71 The root-feeding generations of gall-making aphids of the genera Pachypappa koch, Pachypappella baker, and Gootiella tullgren /Horn. Aphidoidea, Pemphigidae/ R. DANIELSSON 77 Host plant shift, host race formation and spéciation in Cryptomyzus /Homoptera, Aphididae/ J.A. GULDEMOND 89

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