Final diagnosis


Pyrenochaeta lycopersici (Fungal corky root)

Brown alterations, more or less extensive, surround several roots of this lettuce. <b> <i> Pyrenochaeta lycopersici </i> </b> ("fungal corky root")
These alterations are also superficially corky and sometimes form real sleeves, as is the case with tomatoes. <b> <i> Pyrenochaeta lycopersici </i> </b> ("fungal corky root")
<b> <i> Pyrenochaeta lycopersici </i> </b> ("fungal corky root") rarely forms pycnidia on the roots, which have characteristic brown bristles at the level of the ostiole.
The pycnidia of <b> <i> Pyrenochaeta lycopersici </i> </b> ("fungal corky root") have brown bristles (setae) of irregular size. They produce ellipsoid conidia (4-6 x 1-1.5 µm).