Kate Everts, Vegetable Pathologist, University of Delaware and University of Maryland; keverts@umd.edu
As the production of heirloom tomato cultivars increase, it is important to remember that they often lack the disease resistance genes of more “modern” cultivars. We recently tested a few heirlooms in the greenhouse with a local isolate of Fusarium oxysporum f. sp. lycopersici. While the “modern” Florida 47 and Plum Dandy were resistant, Mortgage lifter, Old Brooks, and Tommy Toe were highly susceptible. Our isolate was race 1 or 2 Fusarium oxysporum f. sp. lycopersici.
Reaction of resistant and susceptible tomato cultivars to Fusarium oxysporum f. sp. lycopersici.