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Xanthomonas campestris pv. graminis (Egli et al. ) Dye


Crops attacked: rye-grass, .

[R]Common Names :

Bacterial wilt

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

Yellow gluey colonies isolated in growth medium.

Wilting and drying up of the tillers or the whole plants accompanied or not by leaf necrosis.
No growth of new shoots after mowing.
Yellow stripes turn necrotic along the leaf.
Distorted growth of the leaves out of the sheath or difficulty of cobs (ears, heads) to emerge.
Young leaves have a pale colour.
In the Italian Ryegrass yellow droplets form inside the hollow of the stem.
Affects the value of the forage grass.

Bacterial wilt settles in the xylem vessels.
The disease can only settle through lesions from which it extends to the xylem. It goes counter sap-flow down to the base of the plant and infects the neighbouring tillers.

Spread inside the crop is caused by the infected cutter bar of forage harvesters which can carry the pathogen for several months.

Use resistant cultivars.
Mow in dry weather.
Used mixed species.

[R]Possible misleading

[R] Images

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

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