Final diagnosis


Various omycetes

Many melon seedlings have suddenly wilted and are gradually drying out. Only the lower part of the young stems is still turgid <b> <i> Pythium </i> sp. </b> (damping-off)
<b><i>Pythium </i>sp.</b> 3
The lower part of the stem of this young melon plant shows a wet and dark lesion surrounding it for several centimeters. <b> <i> Pythium </i> sp. </b>
<b><i>Pythium </i>sp.</b> 1
The roots of these 2 melon plants are more or less yellow to brown. The diameter of their neck is somewhat narrowed. <b> <i> Pythium </i> sp. </b>
In addition to the roots, the vessels (V) located at the level of the pivot and just above sometimes show more or less marked browning. <b> Various oomycetes </b>
A dark to black lesion, moist, diffuse around the periphery, surrounds the neck of this melon foot. (<b> Oomycete </b>)
The dark brown cortex is deeply altered, the contiguous tissues are also somewhat damaged. (<b> Oomycete </b>)
Several dark to blackish lesions, progressively necrotizing, extend on the blade of this melon leaf. (<b> Oomycete </b>) (<i> Phythophthora capsici </i>) (Gerald HOLMES - Strawberry Sustainability Research and Education Center, California)
Several large, moist, circular, dark lesions partially cover this melon fruit. (<b> Oomycete </b>) (<i> Phythophthora capsici </i>) (Gerald HOLMES - Strawberry Sustainability Research and Education Center, California)
Oospores of <b> <i> Pythium aphanidermatum </i> </b> are clearly visible in the tissues of this more or less rotten root. (oomycete)