First Report of Root Rot Incited by Thielaviopsis basicola on Lamb's Lettuce (Valerianella olitoria) in Europe

Plant Disease
A GaribaldiM L Gullino

Abstract

Lamb's lettuce (Valerianella olitoria) is increasingly grown in Italy and used in the preparation of processed salad. In the fall of 2003, plants of lamb's lettuce cvs. Trophy and Palmares showing symptoms of severe stunting were observed in several commercial plastic greenhouses near Bergamo in northern Italy. The distribution of the disease was generally uniform in the greenhouses and 10 to 30% of the plants were affected. The first symptoms, consisting of reduced growth of the plants and extensive chlorosis, developed in October at temperatures ranging between 10 and 20°C on 30-day-old plants. The roots of diseased plants showed extensive necrosis that extended to the crown of the plants. The diseased tissue was disinfested for 1 min in 1% NaOCl and plated on potato dextrose agar amended with 100 µg/l streptomycin sulfate. A fungus with the morphological characteristics of Thielaviopsis basicola was consistently and readily isolated from symptomatic tissues (1). Catenulate, cylindrical, hyaline endoconidia and catenulate, subrectangular, thick-walled chlamydospores (aleuriospores) were observed. Ten-day-old plants of cvs. Trophy and Palmares were artificially inoculated by dipping three isolates of T. basicola obtained from ...Continue Reading

Citations

Jul 26, 2019·Plant Disease·Maria Lodovica GullinoAngelo Garibaldi

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