Isoenzyme analysis of isolates of the entomogenous fungi Tolypocladium cylindrosporum and Tolypocladium extinguens (Deuteromycotina ; Hyphomycetes)

Isoenzyme analysis of 11 isolates of Tolypocladium cylindrosporum and T. extinguens revealed considerable variability between strains of the same species and confirmed great differences between the two species. An exception was the striking similarities in isoenzyme patterns observed for the California isolates of T. cylindrosporum isolated from Aedes sierrensis larvae from 1972 to 1979. This considerable homogeneity suggests a rather stable genotypic equilibrium in the fungal population which was maintained with little alteration even after repeated subculturing in the laboratory.