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Mycologia, BASIDIOMYCOTINA, TULASNELLALES, CERATOBASIDIACEAE .

Crops attacked: oats, .

Eyespot

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

[R]Description
Damping-off : necrosis of the coleoptiles.
Affects the organs above the earth : Lesions occur on the leaf-sheaths and on stems as high as 30 cm above the earth. The leaf-sheaths lesions are yellowish-brown with a darker brown irregular margin and a torn center ("cigarette hole" spots). On the stems, the lesions are elongated, oval, with a regular outline and a very pale center. Pinkish-white and purplish-brown pseudo-sclerotia are formed on these spots.
Severely attacked stems lodge.
Shrivelling of the ears in the affected plants.

[R]Biology
The fungus survives in the soil as sclerotia and mycelium.

[R]Epidemiology
.

[R]Treatement
.

[R]Possible misleading
Eyespot ( Pseudocercosporella herpotrichoides ) but Rhizoctonia doesn't cause lesions on the totality of the sheaths.

[R] Images

1. Rhizoctonia cerealis , Eyespot (FOUCHARD M., INRA)
   Cereal eyespot Discoloured spots of Rhizoctonia cerealis surrounded by brown margin.
   
2. Rhizoctonia cerealis , Eyespot (FOUCHARD M., INRA)
   Cereal eyespot Discoloured spots of Rhizoctonia cerealis surrounded by a brown margin.
   
3. Rhizoctonia cerealis , Eyespot (FOUCHARD M., INRA)
   Cereal eyespot Discoloured spots of Rhizoctonia ceraealis surrounded by a brown margin.
   

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

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