White coating on currant leaves

White coating on currant leavesWhite coating on the leaves of the currant is nothing more than powdery mildew - a dangerous fungal disease. The causative agent of the infection is the fungus, which hibernates on sickly fallen berries or affected shoots. During the summer period, repeated infection occurs, which is carried out by spores of the fungus, preserved on infected currant organs. The bushes are gradually weakened, their resistance to frost decreases, and as a result, through 2-3 the plants die.

Symptoms of the disease

The first sign of the disease is a white cobweb patch on the currant leaves, which appeared on the underside. Gradually, he moves to the young shoots, petioles and berries. Subsequently, the plaque thickens, browns and takes the form of felt with black impregnations, which are the fruiting bodies of the fungus.

Covered with such a touch of berries become gray and become inedible. This suggests that the time of the fight against the disease is lost. In this case, in autumn or early spring, you must remove and burn all infected shoots.

In most cases, powdery mildew affects the black currant, but infection of white and red currant bushes is not excluded. The disease occurs in the summer, mainly in the first half, with infection most often from infected gooseberries.

The most favorable conditions conducive to the emergence and development of the disease are:

  • Warm weather 17-28 ° C,
  • High humidity 90%,
  • High soil moisture,
  • Neglect or increased density of planting,
  • Shaded places.

When sweltering dry weather, the development of the disease somewhat slows down.

Fighting white coating on currant leaves

Предотвратить развитие болезни можно только на начальной стадии, сразу после появления белого налета на кустах смородины. Для этого следует весной или осенью опрыскивать зараженные растения специальными препаратами, например: Топаз, Вектра и другие. Обработка производится несколько раз строго по инструкции.

To combat wintering infection, it is necessary to treat bushes with copper sulfate. Sprinkle bushes in cloudy weather or in the evening, while the product should fall on the entire leaf. Processing on sunny hot days is unacceptable.

Folk ways to combat white coating on currant leaves

There are also folk ways to combat white bloom on the currant leaves. Let's get acquainted with the most popular of them:

  1. Коровяк или перепревшее сено в количестве треть часть ведра замачивается в 3 л воды, настаивается 3 суток, после чего разбавляется водой в пропорциях 1:3. Процеженным настоем опрыскивают растения. Обработку кустов достаточно выполнить 3 раза: до цветения, после цветения и перед листопадом.
  2. 1 l reverse, whey or buttermilk dilute 9 L of water. The resulting mixture is treated with plants.
  3. Infusion of wood ash and water, in proportions 300 g ash and 10 liters of water. The bushes should be sprayed 2 times with an interval of 10 days. Apply this method in early spring. It is also possible to use wood ash in a dry form. It should be brought into the near-estuary of the bushes.

To avoid infection, choose currant varieties that are resistant to powdery mildew, for example, Openwork, Vologda, Fragrant and others.

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