back to HYPP Pathology
home page

Mycologia, FUNGI IMPERFECTI, TUBERCULARIALES, TUBERCULARIACEAE .

Crops attacked: oats, .

Foot-rot,

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

[R]Description
- Damping-off :.
The disease occurs during the emergence of young seedlings and manifests as emergence deficiency : germination does take place, but the roots are affected by necrosis or die during development.
The coleoptile is also affected by necrosis, it rolls up,preventing the first leaf from emerging out of the soil.
The roots rot and cause the drying-up of the plant, then its loss.
The plantlets which are less heavily attacked have brown lesions with dark edges on the coleoptile.
- Foot-rot :.
Browning of the sheaths at the base of the plant and of part of the root system.
The step by step attack of successive sheaths can lead to the destruction of the plantlet.
- Attack of the cob and the grain :.
The cob may be infected in the stage of formation.
Shrivelling of the whole or part of the cob.

[R]Biology
The fungus can survive in the soil several months as chlamydospores or mycelium spreading on debris.
Conidia form on the pink cushions on debris and at the base of stems infected by foot-rot.

[R]Epidemiology
18 °C. temperature and the presence of relative humidity in the air for 12 successive hours are necessary for contamination of the cobs to occur.
Conidia are released and transported by the rain and the wind.

[R]Treatement
Use healthy seeds.
Avoid the rotation maize - hard wheat.
Avoid excessive usage of nitrogenous manure without increasing the phosphatic and potassic manure.
Burry the crop debris deep in the soil.

[R]Possible misleading
F. nivale but the latter has no discolored brown ringed area at the base of the glumes.

[R] Images

1. Fusarium roseum , Foot rot (VIDAL L., INRA)
   Cereal foot rot Comparison between a healthy ear of wheat and a ear of tender wheat infected by Fusarium roseum .
   
2. Fusarium roseum , Foot rot (PONCHET J., INRA)
   Cereal foot rot Ears of wheat attacked by Fusarium roseum .
   
3. Fusarium roseum , Foot rot (FOUCHARD M., INRA)
   Cereal foot rot Detail of multicellular asexual spores (conidia), of Fusarium roseum as seen through the light microscope.
   
4. Fusarium roseum , Foot rot (FOUCHARD M., INRA)
   Cereal foot rot Shrivelled wheat heads due to an attack of Fusarium roseum .
   
5. Fusarium roseum , Foot rot (FOUCHARD M., INRA)
   Cereal foot rot Ear-head of wheat shrivelledby Fusarium roseum .
   
6. Fusarium roseum , Foot rot (FOUCHARD M., INRA)
   Cereal foot rot Details of a wheat spicklets that has been shrivelled by Fusarium roseum .
   
7. Fusarium roseum , Foot rot (FOUCHARD M., INRA)
   Cereal foot rot Shrivelling of wheat heads by Fusarium roseum in the field.
   
8. Fusarium roseum , Foot rot (CASSINI R., INRA)
   Cereal foot rot Lodging maize plant following a parasitic foot rot attack.
   

To read this page in French

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

back to HYPP Pathology home page