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The powdery mildew of the vine
The Uncinula necator is a fungus belonging to the Erysiphaceae family which represents the pathogen that produces the powdery mildew of the vine. This is a pathology that manifests itself with spots with a whitish-gray and pulvurent color that cover all the green organs of the plant. The plant that is attacked by the fungus gradually loses color on the leaves, first yellowing and then drying. This disease develops mainly due to heat, humidity and lack of ventilation with temperatures between 8 and 30 degrees, especially in spring and winter. This particular pathology is capable of causing such damage as to produce a loss of the crop. In fact, in addition to hitting the leaves, it is also able to attack the fruits, making them explode if ripe, or not allowing their development.
Onset of the pathology
This is a pathology difficult to counter due to the resistance of the fungus to many types of both chemical and biological intervention. Especially if you get to have a serious or too extensive infection there would be no possible treatment interventions and you should instead eliminate the affected plants, taking care to completely burn the infected plants or dispose of them in a suitable way to prevent the fungus can infest other plants. The biological cycle of the fungus is very long, this is a further problem to be able to counteract the pathology. In fact, during the winter the fungus is able to remain hidden under the remains of organic matter, then releasing the spores in the spring that will infect the vital parts of the plant it feeds on.
Symptoms of vine powdery mildew
Symptoms of this particular type occur despite the pathogen that evidence is not visible to the naked eye. The first symptoms of the disease usually appear in the months between spring and autumn. The first sign of the disease is the appearance of whitish spots on the upper surface of the leaves. After the appearance of the white spots, the first yellowing begins to appear, after which the disease can develop very quickly in other parts of the plant, in fact the buds, flowers and stem can be affected. If not adequately blocked, this pathogen is able to affect the entire plant, causing tissue necrosis, followed by desiccation. Once the disease has affected the entire plant, it is completely covered with a whitish patina.
Powdery mildew of the vine: Prevention and treatment of powdery mildew
To be able to prevent this type of pathology, it would be advisable to prune the plants to ensure correct aeration of the foliage and leaves and to prevent moisture accumulation. If the plants do not need pruning, it would be advisable to grow them in sunny places and with the right ventilation. To make the plants more resistant, especially the vine, one could proceed with the grafting of those species that are more resistant to the fungus. Mulching could be a great way to prevent fungus attack. As materials, male fern leaves should be used which have antifungal properties, avoiding the use of leaves, flowers and dry branches that would create a humid environment. To combat powdery mildew in a natural way, an antagonist fungus, ampelomyces quisqualis, could be used.