RT Journal Article SR Electronic T1 Toxin Production and Pathogenicity Of Ceratocystis ULMI JF Arboriculture & Urban Forestry (AUF) FD International Society of Arboriculture SP 258 OP 260 DO 10.48044/jauf.1981.062 VO 7 IS 10 A1 Lawrence Pusey A1 Charles L. Wilson YR 1981 UL http://auf.isa-arbor.com/content/7/10/258.abstract AB Highly pathogenic isolates of Ceratocystis ulmi produced more toxin (cerato-ulmin) than less pathogenic ones. Toxin production may be a useful criterion for distinguishing aggressiveness among C. ulmi strains.