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Fungal diseases

Ergot

Ergot

Following an infection with ergot (Claviceps purpurea), the floret exudes a sweet, white yellowish substance called honeydew during the flowering time.

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Brown rust

Brown rust

Brown rust or leaf rust (Puccinia recondita) is the most widely distributed and regularly occurring leaf pathogen of rye with a high multiplication rate and a high damaging potential.

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Powdery mildew

Powdery mildew

Powdery mildew (Erysiphe graminis) infects the leaves and leads to a reduced assimilation process when ears start to emerge. Infection is favoured by warm and humid growing locations, susceptible varieties, early sowing, a high population density and excessive nitrogen fertilisation.

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Rhynchosporium

Rhynchosporium

Rhynchosporium-leaf spot (Rhynchosporium secalis) particularly occurs under cool and very wet conditions. It leads to yield loss mainly caused by reducing the TGW. The damage is characterised by 1-2 cm long, at the beginning watery grey-green, later white-grey oval spots, which partly merge.

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Fusarium head blight

Fusarium head blight

Fusarium head blight (Microdochium nivale) infection is caused by contaminated straw or seed. When seedlings are infected the leaves are populated with corkscrewed or dark brown framed spots. After thawing the plants collapse in a nest wise manner and are initially covered with a dirty-white mycelium, which then turns into reddish and finally dirty-brown. In

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Sources:
Heitefuss, König, Obst und Reschke, Pflanzenkrankheiten und Schädlinge im Ackerbau 2003,
Obst und Gehring, Getreide. Krankheiten – Schädlinge - Unkräuter 2002, KWS LOCHOW 2011

 

 

 
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