Ann. Tabac, 1998, Sect. 2-30, p. 21-6., ISSN.0399-0354

Characterization and pathogenicity of 5 French isolates of Rhizoctonia sp. from tobacco

NICOLETTI R.; BLANCARD D.; CAILLETEAU B.
Istituto Sperimentale per il Tabacco, Scafati, Italy
Rhizoctonia sp. hyphae are frequently observed on the collar and the roots of weak tobacco plants. Five isolates from several areas of France and Andorra have been studied. They are multinucleate and belong to the R. solani species, except one of them that is binucleate. The multinucleate isolates have of affinity with AG-1, AG-2-1 and AG-3 anastomosis groups. Among them, 2 isolates of 2 first groups induce damping-off, collar cankers and leaf necrosis of Nicotiana tabacum var. Xanthi NC. The binucleate isolate has the same pathogenicity.