Abstract
Summary Inoculation of lettuce with tobacco-necrosis virus isolated from big-vein plants did not cause big-vein symptoms. Olpidium brassicae was always found in roots of lettuce grown in big-vein-infected soil but not in two gardens where big vein did not occur. Olpidium resting spores were sedimented from big-vein root sap by low-speed centrifuging. Inoculation of lettuce with resuspended sediment produced big-vein symptoms while inoculation with the supernatant liquid did not. Veronica tournefortii Gmel., Stellaria media (L) Vill., and Spergula arvensis L. were found to be hosts of O. brassicae. Inoculation of lettuce with root sap of these species gave rise to big-vein symptoms. Soil treatment with captan, phygon, copper oxychloride, and thiram, all reduced incidence of big vein. These results suggest that O. brassicae is the cause of big-vein disease of lettuce.
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