Nature and Source of Inoculum of Aspergillus niger Causing the Aspergillus Black Mold Disease of Onions in New York

Abstract

During 1997, as in 1996, Aspergillus black mold of onion cause by Aspergillus niger was not the serious disease problem it had been on a number of onion farms in Orange County, New York during 1995. In that year the high incidence of the disease was primarily related to the extremely hot muggy summer weather which occurred during the latter part of the growing season in late July, August, and early September.