Final diagnosis


Ilyonectria liriodendri (Black foot)

This vine affected by black root has chlorotic foliage. <i> <b> Ilyonectria liriodendri </b> </i>
A transverse section allows to visualize in the wood a brown necrotic lesion which must have developed from the bark to the pith. <b> <i> Ilyonectria liriodendri </i> </b> (black foot)
The taproot of this root system and the roots reveal a very dark brown to black coloration characteristic of the black foot. (<b> <i> Ilyonectria liriodendri </i> </b>)
The roots of vines affected by black foot have more or less necrotic roots and are grayish to black in color. (<i> <b> Ilyonectria liriodendri </b> </i>)
After removing the bark and adjoining wood tissue with a knife, a dark brown flame-shaped lesion can be clearly seen. (<i> <b> Ilyonectria liriodendri </b> </i>) (black foot)
The attack of <b> <i> Ilyonectria liriodendri </i> </b> forced this vine to form two clearly visible root trays. (black feet)
On this vine, small black lesions localized to certain vessels are associated with a more extensive central brown lesion. <b> I <i> lyonectria liriodendri </i> </b> (black foot)
This <i> <b> Cylindrocarpon liriodendri </b> </i> mycelial colony shows an orange-brown coloration on culture medium in a Petri dish.
<b> <i> Cylindrocarpon liriodendri </i> </b> forms conidiophores carrying at their end cyclindrical and sometimes curved conidia, presenting more or less partitions.