Powdery mildew: symptoms, prevention, and treatment for all types of crops

Powdery mildew, also known as ash, powder, dust, cenillera, cendrada, sendrosa, sendreta, malura vella, blanqueta, among other names, is a fungus (Uncinula necator) that affects a wide variety of plants. It is characterized by covering the leaves with a gray or white, ash-like coating. As the disease progresses, the leaves turn yellow, dry out, and may drop prematurely.

Powdery mildew usually appears in times of mild temperatures and high humidity. Melons, cucumbers, watermelons, and zucchini are mainly affected in spring. In cabbage, chard and other leafy vegetables, may also appear in autumn. Now that we start with the autumnal pot garden, it is important to monitor their appearance as temperatures drop and humidity increases.

At mediterranean area And in other climates with similar conditions, powdery mildew spreads more rapidly. Factors such as high humidity, moderate temperatures, poor ventilation, low light levels, stale air, and even excess nitrogen in the soil favor its development. In addition, high plant density In urban gardens it hinders air circulation and encourages the proliferation of fungi, so it is advisable to space the plants appropriately.

Prevention of powdery mildew

To prevent its appearance, it is essential to avoid puddles and sources of dirt. It is recommended to promote ventilation and air circulation between plants. Also, apply weekly sprays of propolis (3 ml per liter of water) on the leaves, as it acts as a natural fungicide, strengthening the plants' defenses and fighting fungi and bacteria. Other useful organic remedies include preparations of Horse tail y it.

Early detection and removal of infected plants

Upon detecting the first symptoms, such as whitish, powdery spots on the leaves, infected leaves should be removed immediately. Improving the aeration of the garden by pruning or removing some plants in cases of high density helps reduce favorable conditions for the fungus. If left untreated, powdery mildew can slow growth, yellow leaves, and cause premature leaf drop.

Home treatments for powdery mildew

To combat powdery mildew, the following spray treatments can be applied:

• Skimmed milk (half a litre of milk per 8 litres of water): very effective and natural.
• Hydrogen peroxide diluted in water (75 ml in 5 liters): helps eliminate fungus.
• Sulfur in aqueous spray or powder (never during flowering): effective in eliminating the fungus.

Additional information and specific care

In addition to general treatment, it is important to be alert to the appearance of powdery mildew on different plants, such as tomato, where it is also a frequent pest, or in the vine, which requires specific care for its prevention. Likewise, the roses and other ornamental plants can be affected, so knowing the symptoms helps you act in time.

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