Ramularia

The Ramularia leaf spot is also a fungal disease. Ramularia occurs less often in Germany.

Leaf spots of Ramularia are twice the size of Cercospora leaf spots.

The spots are light brown- gray and sharply limited by a dark border.

Light dots are visible in the spots, these are the carrier of the spores.

The Ramularia beticola Fautr. et Lamb causes the Ramularia leaf spots. The Ramularia leaf spots can be confused with Cercospora leaf spots. However, Ramularia spots are larger and lighter. The definite distinguishing feature is the color of the conidiophores, which are visible as dots in the leaf spot: a Ramularia spot has light conidiophores, in contrast to the dark conidiophores of the Cercospora spots. The temperature and humidity optimum for the development of Ramularia is lower than for Cercospora. Temperatures between 16 and 20 ° C and a humidity of 70% are favourable for the occurrence of Ramularia.

In Germany, the disease occurs more often in autumn, when Cercospora and Ramularia can also occur on the same leaf at the same time. However, also mixed infections of Cercospora, Ramularia, powdery mildew and rust can be observed frequently in this time.