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Effect of Light Duration on Verticillium Wilt of Tomato. John Paul Jones, Professor, University of Florida Agricultural Research and Education Center, Bradenton 33505; Pat Crill(2), and R. B. Volin(3). (2)Former Associate Professor, University of Florida Agricultural Research and Education Center, Bradenton 33505; (3)Assistant Professor, University of Florida, Agricultural Research and Education Center, Homestead 33030. Phytopathology 65:647-648. DOI: 10.1094/Phyto-65-647.

Photoperiod (8,608 lux, or 800 ft-c intensity) drastically affected development of Verticillium wilt of tomato. Symptom development at a 4-hour photoperiod was more rapid and more pronounced and there were fewer escapes in susceptible cultivars than at an 8-, 12-, or 16-hour period.