back to HYPP Pathology
home page

Mycologia, BASIDIOMYCOTINA, UREDINALES, PUCCINIACEAE .

Crops attacked: wheat, .

Brown rust of wheat,

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

[R]Description
Scattered orange pustules aproximatively 2 mm in size occur on the leaves before tillering.
Rare occurence of pustules on the sheaths, stems and ears.
At the end of the vegetative cycle of the cereal, brown pustules are spread all over the upper and lower sides of the leaves.
Shrivelling.

[R]Biology
The survival of the fungus is due to teliospores and more particularly to urediniospores on cereal and grass shoots.
In favourable conditions many cycles of urediniospore production occur.
At the end of the life cycle teliospores form in the black pustules ; they induce the disease in an intermediary host.

[R]Epidemiology
Dispersal of urediniospores by the wind at long distance (20 km).
Optimum germination of urediniospores at 15 - 20 °C. in free water conditions.
Germination and infection can even take place at 5 - 25 °C. during nights with dew.
Beyond 30 °C. the disease stops developing.

[R]Treatement
Use tolerant cultivars.
Same chemical control as for the yellow rust.

[R]Possible misleading
The yellow rust in its first stages.

[R] Images

1. Puccinia recondita , Brown rust (FOUCHARD M., INRA)
   Cereal brown rust Brown rust on winter wheat.
   
2. Puccinia recondita , Brown rust (VIDAL L., INRA)
   Cereal brown rust Uredospore stage of the brown rust of barley.
   
3. Puccinia recondita , Brown rust (FOUCHARD M., INRA)
   Cereal brown rust Observation with a dissecting microscope of brown rust on a wheat leaf.
   

To read this page in French

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

back to HYPP Pathology home page