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    Typhula blight

    overview

    Typhula blight - image 1

    Typhula blight - image 1

    Typhula blight - image 2

    Pest Profile

    • Symptoms & Diagnosis

      Occurence

      Winter barley

      Pattern of damage

      In the spring (after snow melt), patches of yellowed plants appear in the field (Picture 1). Older plants die back from the tip, and the younger leaves are narrow, rigid and straight. The crown roots are destroyed and the root collar has a fibrous, crumbly aspect. The 0.5-4 mm round, brown sclerotia, which are found mainly at the base and under the leaf sheaths of the infected plants, are a typical sign (Picture 2).

      Treatment

      Prevention

      Late sowing at a higher seed density and at a shallow depth. Ensure good soil contact with the seed. Avoid standing water. Optimum fertilization. Avoid a winter barley rotation interval that is too short.

      Remarks

      Spread/transmission: Rounded brown sclerotia (survival structures) are formed on infected plants. In summer, they survive in the dormant state on the soil surface or buried at a shallow depth. From September/October to March, a mycelium grows from them and spreads to the above-ground plant parts. High humidity is necessary for this to occur. High soil moisture, temperatures around freezing and a persisting snow cover are favorable.