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Pseudomonas syringae ssp. savastanoi pv. oleae

Bacteria, GRACILICUTES, PSEUDOMONADALES, PSEUDOMONADACEAE .

Crops attacked: olive .


[R]Common Names :

Tuberculosis of olive-tree

The diseases caused by this bacteria on the hosts mentioned are quite common, specially frequent on the ash-tree (canker of ash-tree).

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


[R]Identification
Visible on the tree, detection of galls that can be formed in almost every part of the plant (plant tissues), including petioles and lamina.

[R]Description
Produces galls (hyperplastic formations) on the young shoots and emergency points of the leaves and cut zones. Past some months the galls acquire a spongy and irregular aspect, becoming hard and brown. On the small shoots the galls reach about 2 cm.
This is one of the diseases that cause major damages on the olive-tree culture, affecting even the olive quality and originating undesirable flavours.

[R]Biology
When developing, the galls produce an abundant bacterial mass that exudates, contaminating new areas through sprinkles of rain.
The galls result from the production by the bacteria of indoleacetic acid (IAA).

[R]Epidemiology
The bacterial populations have an epiphytic phase on the leaves, reaching maximum values on the spring and autumn in some countries like Italy.
The infection rate depends on the number of wounds caused on the trees (pruning wrongly conduced, beating the trees, hailstorm and even by strong winds).

[R]Treatement
Disinfection of the pruning material and, in some countries, withdrawal of the galls before the growth of the epiphytic populations. Apply products with copper by the end of autumn and in the spring.

[R]Possible misleading
.

[R] Images

  1. Pseudomonas syringae , Bacterial canker (GARDAN L., INRA)
    Bacterial canker on olive-tree Bacterial tumour at the fork of an olive-tree branch.
  2. Pseudomonas syringae , Bacterial canker (GARDAN L., INRA)
    Bacterial canker on olive-tree Bacterial tumours which have developped on pruning injuries on the trunk of an olive-tree.
  3. Pseudomonas syringae , Bacterial canker (GARDAN L., INRA)
    Bacterial canker on olive-tree Cross-section through an evolving tumour on the branch of an olive-tree.
  4. Pseudomonas syringae , Bacterial canker (GARDAN L., INRA)
    Bacterial canker on olive-tree Numerous bacterial tumours on the boughs, branches and shoots of an olive-tree.
  5. Pseudomonas syringae , Bacterial canker (GARDAN L., INRA)
    Bacterial canker on olive-tree Fine detail of numerous bacterial tumours on the boughs, branches and shoots of an olive-tree.
  6. Pseudomonas syringae savastanoi , Bacterial canker (NEVES EVARISTO F., MA)
    Bacterial canker on olive-tree Young olive-tree stems with tumours caused by Pseudomonas syringae savastanoi .
  7. Pseudomonas syringae savastanoi , Bacterial canker (NEVES EVARISTO F., MA)
    Bacterial canker on olive-tree Olive-tree boughs with a string of tumours caused by Pseudomonas syringae .
    savastanoi
    .

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

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