Snow mold

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Snow mold

As snow mold ( latin Microdochium nivale ) refers to a lawn disease that causes a weakening of the lawn due to a high load, such as over-fertilization (nitrogen fertilization in autumn), compacted soil (moisture) and high temperature fluctuations.

The disease can occur year-round under unfavorable conditions, but the first signs are often recognizable in spring (infestation in autumn) after the snow has melted.

The gray snow mold ( Latin Typhula incarnata ), also known colloquially as root rot , is one of these clinical pictures. It arises at temperatures around 0 ° C.

causes

An infection by snow mold is favored by various factors. Above all, changeable temperatures around freezing point ensure a more aggressive course of infection. Persistent moisture from fog, drizzle, dew formation and a lack of air movement can be the trigger for fungus formation. In addition, mulch , autumn leaves and grass cuttings can promote the formation of snow mold, since the lack of light weakens the grass and thus increases the risk of infection.

Symptoms

Light gray mycelium

Symptoms are irregular light brown-brown spots that can reach a diameter of over 50 cm. If there is sufficient moisture, a light gray mycelium will form. The gray snow mold has the same damage pattern as the normal snow mold , but the leaves appear dry and paper-like.

Countermeasures

The affected areas usually heal on their own in warm temperatures. Preventive measures are:

• Regular mowing, do not mow too deep (max. 1/3 of the length of the stalk)
• Pay attention to good permeability in the soil, if necessary scarify or aerate and sand
• balanced fertilization (emphasis on potassium in autumn)
• Removal of leaves and lawn clippings

Individual evidence

1. ^ Paul Sorauer: The snow mold . In: Verlag Eugen Ulmer KG (Ed.): Journal for plant diseases . tape 11 , no. 4/5 , November 30, 1901, pp. 217-228 , doi : 10.2307 / 43227149 , JSTOR : 43227149 .
2. ↑ Causes of snow mold. Retrieved November 13, 2018 . 

Web links

• Microdochium nivale. In: Hortipendium - The green lexicon. Service Center Rural Rhine Palatinate, accessed on January 16, 2019 . 

• Microdochium nivale (Frieze) Samuels & Hallett. In: Recognize - understand - avoid plant diseases. Retrieved January 16, 2019 .