Acta Phytopathologica et Entomoligica 26. (1991)

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Contents List of participants Preface Nucleic acid hybridization studies with Swedish BYDV isolates P. Oxelfelt and M. Eweida.................................................................................... 9 Comparison between ELISA and northern dot blot hybridization techniques for BYDV detection in Triticinae species Nazia Loi, C. De Pace, R. Osler, R. Casa and E. Porceddu...........................15 Barley yellow dwarf virus infection of the Gramineae in Tasmania P. L. Guy........................................................................................................................21 Survey of barley yellow dwarf virus (BYDV) from grasses in west of France M. Henry.....................................................................................................................27 Barley yellow dwarf virus in Lolium spp. S. J. I. Holmes............................................................................................................33 The effects of MAV-, PAV- and RPV-like isolates of BYDV on spring and winter barley cultivars G. M. Herrera and R. T. Plumb ...............................................................................41 Different levels of tolerance to barley yellow dwarf virus (BYDV) in some hybrid lines of barley T. Munthe........................................................................................................................47 Plurilocal assessment of the risk of primary infection of young cereals by BYDV in autumn in the west of France C. A. Dedryver, A. Gamon and H. Gillet..................................................................51 The use and validation of the infectivity index as a method of forecasting the need to control barley yellow dwarf virus in autumn-sown crops in the United Kingdom R. T. Plumb and N. Carter.......................................................................................59 Comparison of the most common aphid species in Northern Italy as vectors of a maize isolate of BYDV R. Osier, Nazia Loi, L. Carraro and N. Milani..................................................63 Monitoring the barley yellow dwarf virus infectivity of migrant aphids colonizing oat crops K. Rydén........................................................................................................................69 Aphid colonisation and barley yellow dwarf infections on some grass species in North-East Italy P. G. Coceano, S. Peressini and G. L. Bianchi..................................................75 Virus diseases of Gramineae in Hungary R. Gáborjányi, J. Szirmai, L. Beczner and P. D. Nagy...................................83 Appearance of barley yellow dwarf virus (BYDV) on wheat in Hungary L. Szunics, Ludmilla Szunics, L. Stéhli and E. Pocsai......................................87 Studies on UK isolates of barley yellow mosaic virus M. J. Adams, A. G. Swaby and P. Jones.........................................................91 Studies on strains of barley yellow mosaic virus (BaYMV) A. Stanarius, G. Proeseler and T. Kühne...........................................................95

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