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Main symptoms


After periods of rain or excessive irrigation, tiny oily spots can be observed to form instead on well-developed leaves and on the periphery of the blade. Subsequently, these spots spread rapidly; they are more or less circular, moist and translucent in appearance, gradually turning brown with age to reach a dark brown to black tint (Figures 1 and 2). These spots widen and merge (figure 3); eventually, whole leaves are damaged (Figure 4). V-shaped wilting beginning at the edge of the leaf blade has also been reported. The lesions gradually turn brown in their center and necrotize (Figure 5), especially when the weather becomes milder and the air is drier.

Other symptoms are associated with the presence of this bacteria:
- apple rot is sometimes observed when climatic conditions are particularly favorable; it seems to be aggravated by various secondary microorganisms;
- wet deterioration of the stem, on young plants;
- a symptom of a hollow stem. In this case, the plants may be stunted and / or show wilting.

In addition, Xanthomonas campestris pv. vitians melting could be responsible for of seedlings.

Last change : 04/26/21
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Figure 5