Pepper powdery mildew (Leveillula taurica) – identify and control
Pepper powdery mildew, Leveillula taurica, although it has the same causal pathogen agent as tomato powdery mildew, is less common.
Symptoms. On the basal leaves, there are yellow spots of 2-4 cm, with a diffuse outline. These will be better delimited only after the appearance of the patchy, white powdery growth than enlarges and cover the entire lower leaf surface. After some time, the powdery growth is present on the upper leaf surface as well. Then, the disease also spreads to the flowers, and even the young fruits. If the temperatures oscillate between 18-24 ° C and the atmospheric humidity is between 70-80%, the fungus spreads on the upper leaves. After a short time, the pepper bushes begin to lose leaves, and finally, the plants dry out.
The pathogen is Leveillula taurica. The fungus resists in soil on plant debris in the form of resistance fruiting. From there, next year, the spores that can produce new infections will come out. During the growing season, the fungus spread through the spores carried by the wind, the drops of rainwater, or the irrigation water.
Prevention and control. In protected crops, it is recommended to disinfect the soil (with specific products), crop rotation, destruction of plant debris, and remove the plants at the appearance of the first symptoms. During the growing season, to control pepper powdery mildew, the application of specific fungicides is recommended.
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