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Pyrenophora graminea Ito et Kuribay

Mycologia, ASCOMYCOTINA, DOTHIDEALES, PLEOSPORACEAE .

Crops attacked: barley .


[R]Common Names :

Barley leaf stripe

Occurs throughout Europe where barley is present.

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


[R]Identification
.

[R]Description
Yellow, thin, elongated leaf spots parallel to the leaf rib occur early in the seedling stage.
Later, these lesions become necrotic and cause the splitting of the leaf blade in stripes which wilt, dry out and fall around the stubble.
Most or all leaves carry the symptoms of the disease.
Infected plants are stunted and heading is totally or partially obstructed.
Seriousshrivelling.
Winter barley is more severely affected than spring barley.

[R]Biology
The mycelium survives in the seed and causes the primary infection in the seedling when the seed germinates in the soil.
Conidia may occur on the lesions and contaminate the neighbouring seedlings.
Persistence of the mycelium in the stubbles can cause secondary contaminations of the leaves but these lesions usually reach only 2 - 3 cm.

[R]Epidemiology
Primary infections can occur if the temperature is over 8 C. at germination.
The optimum range for the development of the disease is 12 - 16 C.
Cold humid soils at emergence and in the first growing stages favour the disease.

[R]Treatement
Avoid early sowing.
Treat the seeds.
Fungicidal treatment according to regional advise at heading.

[R]Possible misleading
.

[R] Images

  1. Helminthosporium gramineum , Barley leaf stripe (BASF)
    Barley leaf stripe Brownish-black necrosis parallel to the veins caused by Helminthosporium disease.

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

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