First Report of Lettuce Big Vein in Florida. B. W. Falk, University of Florida Everglades Research and Education Center, Belle Glade 33430. V. L. Guzman, University of Florida Everglades Research and Education Center, Belle Glade 33430. Plant Dis. 68: 918. Accepted for publication 23 July 1984. Copyright 1984 The American Phytopathological Society. DOI: 10.1094/PD-68-918c.
Lettuce big vein (LBV), a severe disease of head lettuce (Lactuca sativa L.) occurring worldwide where lettuce is grown during cool weather, has never been found in Florida. In February 1984, however, several lettuce plants of the cultivar Montello showing the typical LBV symptoms of stunting and pronounced clearing adjacent to veins were observed in a Florida field. OIpidium brassicae (Woron.) Dang., the fungal vector of LBV, was found in roots of lettuce seedlings grown in soil collected from this field and in four of 11 other field soils where no LBV symptoms had been observed in previous years. Lettuce seedlings of cv. Great Lakes 659 inoculated with O. brassicae zoospore suspensions from LBV field-collected plants showed typical LBV symptoms 8 wk after inoculation; noninoculated seedlings did not show symptoms.