In addition to the mildew, the grapevine is one of the economically most important grapevine diseases. Thunderstorms and heavy rain in the spring are seemingly basic prerequisite for the spread and infection of plants with the vine diseases. The infection occurs through the vine leaves fungal spores from the soil. Subsequent warm humid weather conditions contribute to the spread then with the disease.
A stain on the sheet which is often occurs as a circle round to brightening the day the first signs of vine diseases. Later, the disease will show a lawn fungus on the underside of the leaf. Even the wood maturation of the shoot is affected not only the quality of the grapes. As the vines are highly susceptible Müller Thurgau , Chasselas and Portuguese .
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