Final diagnosis


Black spot disease (Pseudomonas cichorii)

The spots show quite variable sizes, their black colour makes them particularly characteristic. <b><i>Pseudomonas cichorii </i></b>(black spot disease)
In moist period, the bacterium grows on the periphery of the spots, giving them a greasy halo. <i><b>Pseudomonas cichorii </b></i>(black spot disease)
Black, irregular spots inducing a partial chlorosis of the lamina. <b><i>Pseudomonas cichorii</i></b> (black spot disease)
The bacterium infects in particular the mature lower leaves; lamina may locally become liquid and disappear. <b><i>Pseudomonas cichorii </i></b>(black spot disease)
The spots are sometimes large and surrounded by irregular concentric rings corresponding to different phases of development of the bacterium. <i><b>Pseudomonas cichorii </b></i>(black spot disease)
Some spots start from the lamina margins, especially from the leaf tip; water retention in these areas favours the penetration of bacteria into the lamina. <i><b>Pseudomonas cichorii </b></i>(black spot disease)
Late attacks of the bacteria in the field cause many black spots on the leaves during curing. <b><i>Pseudomonas cichorii </i></b>(black spot disease)