van den Bosch
First, third, and fourth authors: Department of Phytopathology, Wageningen Agricultural University, P.O. Box 8025, 6700 EE Wageningen, the Netherlands; second author: Department of Mathematics, Wageningen Agricultural University, Dreijenlaan 4, 6703 HA Wageningen, the Netherlands
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Accepted for publication 13 February 1998.
© 1998 The American Phytopathological Society