VIEW ARTICLE

The Localization of Fusarial Infections in the Vascular Tissue of Single-Dominant-Gene Resistant Tomatoes. C. H. Beckman, Professor, University of Rhode Island, Kingston 02881; D. M. Elgersma(2), and W. E. MacHardy(3). (2)Research Plant Pathologist, Phytopathologisch Laboratorium “Willie Commelin Scholten”, Baarn, The Netherlands, and Visiting Research Fellow and NATO Science Fellow; (3)Research Associate of Plant Pathology, University of Rhode Island, Kingston 02881, Present address: Department of Environmental Biology, University of Guelph, Guelph, Ontario, Canada. Phytopathology 62:1256-1260. Accepted for publication 12 May 1972. DOI: 10.1094/Phyto-62-1256.

Results indicate that the sealing off of vascular infections by rapid tylose development is the basis for the single-dominant-gene type of resistance of tomato to Fusarium wilt. Extensive secondary distribution of the pathogen in the susceptible host occurs because tylose development, although initiated normally, is retarded about 2 days after inoculation. Complete occlusion in many infected xylem vessels is delayed 7 days or more after inoculation.