A new genus and species of fungus, Orthomyces aleyrodis Steinkraus, Hu
mber & Oliver gen. & sp, nov. (Entomophthorales: Entomophthoraceae) is
described. In 1994 and 1995, this fungus caused epizootics in high po
pulations of bandedwinged whitefly (Trialeurodes abutilonea) on cotton
and cocklebur in Alabama. In 1996, T. abutilonea populations were low
er and no infected specimens were found. This is the first report of a
n entomophthoralean infecting an aleyrodid in the New World and the fi
rst report of entomophthoralean epizootics in whiteflies, (C) 1998 Aca
demic Press.