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Bacteria, GRACILICUTES, PSEUDOMONADALES, PSEUDOMONADACEAE .

Crops attacked: hazel .

Dye of hazel

Identification, Description, Biology, Epidemiology, Treatement, Possible misleading, Images

[R]Description
This bacterium causes little polygonal water-soaked lesions (1-2mm diameter) yellowish-green to dark green on the leaves and husks.
On the twigs the necrotic lesions are brown and are localised on the apex and the nodes.
Severe loss is reported in the nurseries : cankers and die-back of the twigs which collapse at the canker spot.

[R]Biology
.

[R]Epidemiology
Dye is spread through appliances and also by rains and wind.
The nurseries are seriously affected when there is no water-supply.

[R]Treatement
Remove the marcots which carry the cankers and necroses.
Avoid water-spraying the crop.
Facilitate early planting of the seedlings and protect them against overheating.

[R]Possible misleading
.

[R] Images

1. Xanthomonas campestris corylina , Dieback (GARDAN L., INRA)
   Hazel-tree dieback Numerous necrosis on marcots.
   
2. Xanthomonas campestris corylina , Dieback (GARDAN L., INRA)
   Hazel-tree dieback Fat necrosis of hazel-tree producing a yellowing of young leaves.
   
3. Xanthomonas campestris corylina , Dieback (GARDAN L., INRA)
   Hazel-tree dieback Brown, fatty spot of Xanthomonas campestris corylina on leaf.
   
4. Xanthomonas campestris corylina , Dieback (GARDAN L., INRA)
   Hazel-tree dieback Fatty spots of Xanthomonas campestris corylina seen in transparency.
   
5. Xanthomonas campestris corylina , Dieback (GARDAN L., INRA)
   Hazel-tree dieback Canker with cracks on a bud.
   
6. Xanthomonas campestris corylina , Dieback (GARDAN L., INRA)
   Hazel-tree dieback Brown necrosis surrounded by a fatty halo of Xanthomonas campestris corylina on hazelnut.
   
7. Xanthomonas campestris corylina , Dieback (GARDAN L., INRA)
   Hazel-tree dieback Destruction of a bud and necrosis of a shoot on a hazel-tree runner caused by black rot.
   

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HYP3 on line : Species (scientific name), Diseases (common names), Glossary, Crops.

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