Final diagnosis


Pyrenochaeta lycopersici (corky root)

Pyrenochaeta6
Pyrenochaeta7
Pyrenochaeta1
Pyrenochaeta5
Pyrenochaeta2
A superficial suberization of the cortex by sectors can be observed on the roots. Affected tissues take on a brown to brown tint. <i> <b> Pyrenochaeta lycopersici </b> </i> (corky roots, corky root)
Pyrenochaeta3
Pyrenochaeta4
The attack level of <b> <i> Pyrenochaeta lycopersici </i> </b> on this root system is much greater: the corky sleeves are much more evolved and marked.
Numerous small necrotic lesions, portions of very brown corky roots in places. <b> <i> Pyrenochaeta lycopersici </i> </b>
Suberization is soon generalized. Some corky sleeves are cracked. <i> <b> Pyrenochaeta lycopersici </b> </i> (corky roots, corky root)
<i> <b> Pyrenochaeta lycopersici </b> </i> (corky root) rarely forms pycnidia on the roots. These have brown bristles located at the level of the ostiole which make it easy to identify this fungus.
These two pycnidia of <b> <i> Pyrenochaeta lycopersici </i> </b> are characterized by the presence of several setae implanted around the ostiole of these fungal structures (corky root disease, corky root).
The pycnidia of <b> <i> Pyrenochaeta lycopersici </i> </b> are brown and globular, ranging in diameter from 150 to 300 µm. They are provided with several brown and septate bristles (<i> setae </i>) arranged around the ostiole (corky root disease, corky root).