Final diagnosis


Monosporascus cannonballus

A significant number of melon plants began to wilt, turn yellow and dry out as harvest approached. <b> <i> Monosporascus cannonballus </i> </b>
In addition to sudden leaf wilting, yellowing is observed on plants which quickly dry out. <b> <i> Monosporascus cannonballus </i> </b>
This root system is entirely altered by the combined action of a <i> <b> M. cannonballus </b> </i> and <b> <i> Phomopsis sclerotioides </i> </b>.
Monosporascus2
Monosporascus5
<i> <b> Monosporascus cannonballus </b> </i> causes rotting of the root cortex which can be amplified by secondary invaders or not.
The rootlets of this root have disappeared. A dark brown lesion around the girdle for several centimeters. <i> <b> Monosporascus </i> sp. </b> in complex with <i> Phomopsis sclerotioides </i>
<i> <b> Monosporascus </i> sp. </b> causes rotting of the root cortex which may or may not be amplified by secondary invaders.
Several black spherical structures, perithecia, are clearly visible on this brown, rotten melon root. <i> <b> Monosporascus </i> sp. </b>
Monosporascus-Courgette7
A few spherical and black perithecia are visible on this altered root. <i> <b> Monosporascus </i> sp. </b>
In addition to a perithecium of <i> <b> Monosporascus </i> sp. </b>, microsclerotia of <i> <b> Phomopsis sclerotioides </b> </i> are also observed on this root rotten melon.
Spherical and brown perithecium in place in the cortex of a root. <i> <b> Monosporascus </i> sp. </b>
This perithecium was pressed to release asci containing a more or less mature ascospore, some still hyaline, others slightly brown. <i> <b> Monosporascus </i> sp. </b>
Several asci containing a single spherical ascospore. <i> <b> Monosporascus </i> sp. </b>
Ascus containing a single spherical ascospore still hyaline. <i> <b> Monosporascus </i> sp. </b>