M. J. C.
First and second authors: Department of Plant Sciences, University of Cambridge, Downing Street, Cambridge, CB2 3EA, United Kingdom; and first and third authors: IACR-Broom's Barn, Higham, Bury St. Edmunds, Suffolk, IP28 6NP, United Kingdom
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Accepted for publication 16 September 1998.
© 1999 The American Phytopathological Society