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Snow rot
Typhula incarnata
General Description
Snow rot is a disease most commonly associated with crops of winter barley in cropping situations where snow cover is common over the winter.
Biology
Snow rot is most common in short rotations where crops are under snow cover for several weeks. Crops most likely to be affected are those suffering from manganese deficiency. The damage is most evident in the spring when patches of crop have been killed. On close inspection of the dead plant material and the plant stems, you can see small orange coloured fungal bodies. These will be the source of inoculum in the following season.
The disease is now relatively rare but, following on from extensive snow cover in December and January, it may be more common this season.