Final diagnosis


Bactéries foliaires

Several leaves from the heart of this escarole show peripheral blackening. <b> <i> Pseudomonas </i> spp. </b>
Several leaves of this lettuce have their edges abnormally cut, this after the tissues have taken a brown to black color and have liquefied. <b> Bacteriosis </b>
In the presence of free water for a prolonged period, it is not uncommon for the leaves of the heart and the apple to rot completely. <b> Various bacteria </b>
In some situations, the leaves break down and salads appear to melt. <b> Various bacteria </b>
Moist and translucent lesions darken and gradually spread to the periphery of this lettuce leaf, all the more so if the ambient humidity persists. Such symptoms can occur as a result of "tip-burn" damage on which bacteria can settle. <b> <i> Pseudomonas </i> spp. </b>
Several wet and black spots sometimes have irregular outlines giving them a "starry" appearance. <b> <i> Pseudomonas cichorii </i> </b> ("bacterial leaf spot")
<b> bacterial attacks </b> often result in brown to black wet spots, sometimes surrounded by a more or less marked yellow halo.
A moist black-brown lesion extends over the midrib and a few secondary veins of this escarole leaf. <b> <i> Pseudomonas cichorii </i> </b> ("bacterial leaf spot")