Nature and Source of Inoculum of Aspergillus niger Causing the Aspergillus Black Mold Disease of Onions in New York
Lorbeer, James W.; Ransom, Viveka E.; Tuffley, Jessica J.
Onion growers in New York especially those in Orange County continue to remain quite concerned about the possibility that a serious outbreak of Aspergillus black mold caused by Aspergillus niger could occur in any given year, particularly if weather favoring the disease (hot, humid, and rainy conditions) occurs during the latter part of the growing season (mid July to the end of August). A major outbreak of the disease occurred in Orange County in 1995 with serious economic consequences for a number of growers and the disease has been present each year since 1995 generally at low levels although a number of minor outbreaks since then have occurred. Since knowledge concerning the etiology of the disease is limited, continued research on the nature of A. niger as an onion pathogen is required to ultimately develop effective management procedures based on that knowledge to prevent both major and minor outbreaks of the disease as well as to attempt to prevent the low levels of the disease that occur annually on most New York onion farms. New York onion growers continue to request that in depth research on the nature and control of black mold be continued each year until reliable management procedures for control of the disease are developed.
New York State IPM Program
Agricultural IPM; Vegetables; Onions