Tomato powdery mildew (Leveillula taurica) – identify and control
Tomato powdery mildew, Leveillula taurica, is a disease that causes significant damage to tomatoes crops.
Symptoms. The fungus can attack all aerial organs, but it is especially noticeable first on the basal leaves and then, it is present on the upper leaves. The affected leaves have yellow spots on the upper part, and on the lower part of the leaf, the area is covered with a white-gray mycelium, with a powdery appearance. The affected tissues turn brown, the leaves dry out completely. On the attacked plants, a small number of fruits are formed, smaller in size, which reaches late maturity. The fungus causes greater damage in crops in protected areas, where its evolution is favored by temperatures between 18-24°C and humidity of 70-82%. Eggplant, peppers, artichokes, and even some pumpkins are part of the circle of host plants of this pathogen.
The pathogen is Leveillula taurica. The fungus resists in the soil on plant debris in the form of resistant fructifications, from which next year will emerge spores that can cause new infections. During the growing season, the spores carried by the wind, the drops of rainwater, or the irrigation water, ensure the spread of the fungus.
Prevention and control. To prevent tomato powdery mildew, it is recommended to gather the plant’s debris and burn them, and crop rotation. During the growing season, the application of specific fungicides is recommended.
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