Final diagnosis


Pseudomonas syringue pv. aptata

Small brown necrotic spots, wet then chlorotic on the periphery, are visible on this melon leaf. <b> <i> Pseudomonas syringae </i> pv. <i>aptata</i> </b> (fire blight)
Many greasy spots gradually becoming necrotic, irregular in shape, appeared on these melon leaves. <i> <b> Pseudomonas syringae </b> </i> (bacterial blight of melon)
At the end of the development, the spots on the leaves become completely necrotic and brownish. <i> <b> Pseudomonas syringae </b> </i> (bacterial blight of melon)
Psyringae2
Observed on the upper surface of the leaf blade, the spots have an irregular shape and are more or less delimited by the veins. <i> <b> Pseudomonas syringae </b> </i> (bacterial blight of melon)
Under the limbus, the spots reveal an oily halo on the periphery when they are not too old and / or the climate is not dry. <i> <b> Pseudomonas syringae </b> </i> (bacterial blight of melon)
<b><i>Pseudomonas syringae</i> pv.<i>aptata</i></b> 12
<b><i>Pseudomonas syringae</i> pv.<i>aptata</i></b> 7
<b><i>Pseudomonas syringae</i> pv.<i>aptata</i></b> 5
<b><i>Pseudomonas syringae</i> pv. <i>aptata</i></b> on melon
<b><i>Pseudomonas syringae</i> pv. <i>aptata</i></b> on melon
Under the blade of this leaf, we can clearly distinguish by transparency the humid halo which surrounds each spot. <b> <i> Pseudomonas syringae </i> pv. <i>aptata</i> </b> (fire blight)
<b><i>Pseudomonas syringae</i> pv.<i>aptata</i></b> 4
Psyringae4
<b><i>Pseudomonas syringae</i> pv. <i>aptata</i></b> on melon
<b><i>Pseudomonas syringae</i> pv. <i>aptata</i></b> on melon
This petiole is surrounded by a longitudinal canker lesion of a partially moist dark brown tint. <b> <i> Pseudomonas syringae </i> pv. <i>aptata</i> </b> (fire blight)
<b><i>Pseudomonas syringae</i> pv.<i>aptata</i></b> 6
<b><i>Pseudomonas syringae</i> pv. <i>aptata</i></b> on melon
A few irregularly shaped longitudinal necrotic lesions are present on this section of melon stem. <b> <i> Pseudomonas syringae </i> pv. <i>aptata</i> </b> (fire blight)
The lesions on the petioles are sometimes rather cankerous, and reach the lamina. <i> <b> Pseudomonas syringae </b> </i> (bacterial blight of melon)
<b><i>Pseudomonas syringae</i> pv. <i>aptata</i></b> on melon
A multitude of small wet lesions cover this melon. <b> <i> Pseudomonas syringae </i> pv. <i>aptata</i> </b> (fire blight)
<b><i>Pseudomonas syringae</i> pv. <i>aptata</i></b> on melon
These two contiguous circular spots are made up of concentric dark green wet years. <b> <i> Pseudomonas syringae </i> pv. <i>aptata</i> </b> (fire blight)
<b><i>Pseudomonas syringae</i> pv. <i>aptata</i></b> on melon
As it progressed, this lesion gradually turned brown and took on a black tint. <b> <i> Pseudomonas syringae </i> pv. <i>aptata</i> </b> (fire blight)
A tagential cut at the level of a spot on the fruit shows that the deep tissues are also affected. They are translucent and have a blackish tinge. <b> <i> Pseudomonas syringae </i> pv. <i>aptata</i> </b> (fire blight)
<b><i>Pseudomonas syringae</i> pv. <i>aptata</i></b> on melon
The tissues underlying the lesion on fruit are translucent, somewhat suberized and collapsed; a cavity is forming. <b> <i> Pseudomonas syringae </i> pv. <i>aptata</i> </b> (fire blight)