The most common diseases of redcurrant are: anthracnose, powdery mildew, septoria. Let's consider them in more detail.
This berry bush is most affected by the pseudo specimen fungus. The peak of this disease of red currant, called anthracnose, occurs in the middle or end of the summer season. The disease is caused by a violation of the physiological functions of the plant, entailing inhibition of its development and, as a result, a decrease in yield next year. From this disease, red currant is mainly affected by leaves, occasionally cuttings or berries. On the affected areas, very small, one millimeter in size, brown spots appear, which subsequently turn black. With a severe defeat, the bush reduces its growth by a third, and the crop - by half.
The degree of disease of this garden culture with anthracnose depends not only on the weather, variety and age of the plant, but also on the infection of the area where redcurrant grows. Diseases (usually naked plants usually depict their photos) are expressed in the drying of leaves and their premature decay. Most often this can be observed during stagnation of moisture, as well as in humid and cool weather, since fungal spores are spread by rainwater. It is necessary to fight with anthracnose by spraying. An ideal medicine is a one percent solution of Bordeaux fluid.
The causative agent of such a disease of red currant as septoria is the organism Ribis Desm. Rounded or angular spots are formed on the leaves of the garden culture, at first brown, and then whitening. At the edges of the lesions, brown streaks form. Leaves dry and fall off.
Agrotechnical and chemical measures to combat septoria are the same as with anthracnose. The microorganism sferoteka morsuwe can cause the disease of red currant, called American powdery mildew. The disease covers not only the foliage of the garden bush, but also its petioles, shoots, buds and, of course, berries. At first, symptoms of the disease are observed on the apical shoots. The lower side of their leaves along the veins in the lateral lobes is covered with a powdery white coating, gradually turning into a dense felt layer with a brown color. The degree of damage to the bush depends on the weather, varietal characteristics and contamination of the site. From this disease, red currant sharply decreases its winter hardiness. In addition, the leaves become ugly, twisted. The spread of American powdery mildew is facilitated by mild winters with an abundance of snow, creating a
greenhouse effect. With a dense planting from this disease, red currant can die almost all other berries, such as gooseberries or raspberries.
Agrotechnicians recommend periodic prevention of this disease, feeding garden crops with nitrogen fertilizers. Of the chemicals used to combat American dew, a solution of soda ash with the addition of soap is most suitable. You need to spray twice with an interval of ten days approximately fifteen or twenty days before the start of harvest.
The fight against diseases of red currant should include their preliminary prevention.