back to HYPP Pathology
home page

Mycologia, ASCOMYCOTINA, HELOTIALES, DEMATIACEAE .

Crops attacked: rape .

Cylindrosporium disease

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

[R]Description
All the organs of the plant can show symptoms.
In autumn minute sporulating areas (<1mm) occur on the hypocotyl and the cotyledons. When the cuticle is lifted, the rosette shows lead like zones which get ruptured exposing white masses of conidia grouped in concentric circles (acervuli).
Wilting and premature defoliation.
In spring the disease spreads to the caulinary leaves and the bracts.
Attack also occurs on the flower parts. Infection of the pedicels can cause the fall of the pods. Pods become dehiscent.
Loss of plants in the field.

[R]Biology
Primary inoculum is made of conidia surviving on crop debris and on weeds.
Conidia can also be carried on seeds.
Mycelium develops between the cuticle and the epidermis.
The first symptoms (acervuli) show after 15 days of incubation.
The actual role of the sexual stage in the epidemics is not proved (occurence of apothecia at the end of the epidemics).

[R]Epidemiology
Wet climates favour the epidemics.
Rain running water and splash facilitate the contaminations to foci-plants and neighbouring plants.

[R]Treatement
Deep burry contaminated crop debris in the soil.
Treatment of the seeds.
Chemical control when the life cycle starts over again (C1-C2 stages) or as soon as the first symptoms occur on the leaves.
Use tolerant cultivars.

[R]Possible misleading
The Mycosphaerella brassicicola on the leaves and Pseudocercosporella capsella on the stem and the pods.

[R] Images

1. Cylindrosporium concentricum , Cylindrosporium disease (RENARD M.,INRA)
   Cylindrosporium disease of crucifers Spots of cylindrosporium disease on a rapeseed stem.
   
2. Cylindrosporium concentricum , Cylindrosporium disease (RENARD M., INRA)
   Cylindrosporium disease of crucifers Spots of cylindrosporium disease on rapeseed stem.
   
3. Cylindrosporium concentricum , Cylindrosporium disease (MARTIN D., INRA)
   Cylindrosporium disease of crucifers Turgidnesses and necrosis of cylindrosporium disease on leaf margins of rapeseed.
   
4. Cylindrosporium concentricum , Cylindrosporium disease (MARTIN D.,INRA)
   Cylindrosporium disease of crucifers Sporulating spots of Cylindrosporium concentricum on a rapeseed leaf.
   
5. Cylindrosporium concentricum , Cylindrosporium disease (MARTIN D.,INRA)
   Cylindrosporium disease of crucifers Perithecia of Cylindrosporium concentricum on rapeseed crop residues from the previous year.
   
6. Cylindrosporium concentricum , Cylindrosporium disease (MARTIN D.,INRA)
   Cylindrosporium disease of crucifers Light microscope observation of a pycnidium of Cylindrosporium concentricum infecting a rapeseed leaf.
   
7. Cylindrosporium concentricum , Cylindrosporium disease (MARTIN D., INRA)
   Cylindrosporium disease of crucifers Spots due to Cylindrosporium concentricum on a rapeseed leaf.
   
8. Cylindrosporium concentricum , Cylindrosporium disease (MARTIN D., INRA)
   Cylindrosporium disease of crucifers Germinating spores of Cylindrosporium concentricum that have been dyed for observation with a microscope.
   

To read this page in French

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

back to HYPP Pathology home page