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The invasive fungal pathogens  Ophiostoma ulmi  and  O. novo-ulmi  have caused two successive pandemics of Dutch elm disease since the beginning of the 20 th  century. In nature, the highly aggressive  O. novo-ulmi  may hybridize with the less aggressive  O. ulmi . Growth rate and molecular analyses were conducted on an unusual, moderately aggressive  O. novo-ulmi  isolate, AST27, carrying an introgressed pathogenicity gene,  Pat1-m ; on highly aggressive  O. novo-ulmi  isolate H327; on  O. ulmi  isolates Q412T and W9; and on progeny from laboratory crosses between H327 and AST27. Genetic analysis indicated that the  Pat1  and  Mat1  (mating type) loci were in different linkage groups corresponding to  O. novo-ulmi  H327 chromosomes 1 and 2, respectively. Most of the molecular differences between the nuclear genomes of H327 and AST27 occurred in the vicinity of  Pat1  and  Mat1 . In addition, two putative quanti-tative trait loci,  Mgr1  and  Mgr2 , which influence mycelial growth rate at 21°C and 28°C, the optima for  O. novo-ulmi  and  O. ulmi , were linked to  Mat1  and  Pat1 , respectively.

Ophiostoma ulmi DNA naturally introgressed into an isolate of Ophiostoma novo-ulmi is clustered around pathogenicity and mating type loci