First author: School of Plant Sciences, The University of Reading, 2 Earley Gate, Whiteknights, Reading RG6 6AU, England; and second author: Plant Biology and Biogeochemistry Department, Risø National Laboratory, P.O. Box 49, DK, 4000 Roskilde, Denmark
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Accepted for publication 24 February 1998.
© 1998 The American Phytopathological Society