Soot
| Soot | ||||||||||||
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Soot on a rose |
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Diplocarpon rosae | ||||||||||||
| FA Wolf |
Star soot ( Diplocarpon rosae ), also known as black spot disease , is a hose fungus that causes one of the most common fungal diseases of the rose , but also affects other plants, such as laurel .
The leaves initially show round, blackish-brown spots that often spread out in a star shape. The affected leaves turn yellow and eventually fall off. This restricts assimilation , which means a weakening of the plant. Leafless plants hardly produce new flowers, new shoots cannot form wood and do not mature, which results in less frost resistance .
The disease is caused by fungal spores that overwinter in the soil , which are often sprayed onto the rose by irrigation or rainwater, where they spread to a greater or lesser extent depending on the sensitivity of the variety.
In order to prevent illness, it is important to increase the plant's resistance through an appropriate supply of nutrients. Since the infestation is difficult to control, it is recommended that the plants are preventively sprayed as early as May. When watering, care must be taken to ensure that only the roots are poured so as not to provide the fungus with a humid climate on the leaves.
If the plant is sick, it must be treated with a suitable spray. Diseased leaves and infected shoots must be removed and disposed of in the garbage can to prevent the infection from spreading.
In addition to the use of plant protection preparations and the spraying of the roses we recommend horsetail tea. From spring should the roses regularly with ausgegorener nettle jauche pour the floor with wood ashes of beech sprinkle.
Web links
- Star soot: Avoid peeling roses in summer , Gartentechnik.de