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Cucumber downy mildew (Pseudoperonospora cubensis) – identify and control
Cucumber downy mildew, Pseudoperonospora cubensis is frequently found on cucumbers, melons, melons, squash, which is particularly harmful to crops in protected areas.
Symptoms. It attacks only the leaves, in the form of light green spots on the upper face, angular spots, well delimited by the veins of the leaves. The color of the spots changes to yellow, then to brown, and on the underside of leaves, a gray-purple fuzz appears. Under favorable conditions, the spots can join and a large part of the leaf is destroyed, and the plants will quickly remain without leaves. Infections occur in humid weather, at temperatures between 5-30°C (optimally 23°C) when spores appear that will germinate and give filaments of infection. They penetrate through the stomata of the leaves, which have at least half of the normal surface. The viability of the spores depends on the temperature, light intensity, and atmospheric humidity. In dry weather and at temperatures above 32°C the spores die. In dry tissues, spherical, yellow-brown resistance spores form.
The pathogen is Pseudoperonoospora cubensis. It is spread by rainwater or irrigation water. Sprinkler irrigation applied in the morning until 10 o’clock, when the spread of spores is at the highest level, starts a strong attack of this disease. The transmission of the fungus from one year to another is ensured by the resistant spores present in the plant debris, but the infections from the following years can also come from the spores brought by the wind from the areas with mild winters, where they remain viable on dry twigs.
Prevention and control. As the first measure to prevent cucumber downy mildew, it is necessary to burn the debris of the infected plants or to bury them in depth. In the vegetable crop, the pumpkins will return after at least 4 years on the same soil. In protected areas, good ventilation of the crop will be ensured, and in case of attack, the humidity will be reduced.
During the growing season, treatments with specific fungicides are recommended.
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