How to find out what hurts currants?

Successfully fighting currant diseases in the garden can be, if you learn to distinguish between their signs, otherwise all your efforts will be in vain, and the harvest will be lost. For correct diagnosis you need to know the main symptoms of the most common diseases.

Sometimes on the leaves and berries of the currant can be seen a whole "bunch" of spots of different colors and shapes. Which of them are indications that the plant lacks nutrients, and which ones are a sign of a serious disease? Is it possible to recognize the disease at an early stage and cure it? Let's find out.

If you notice dark brown spots on currant leaves, which gradually merge, and the leaves turn yellow and fall prematurely - this anthracnose (Pseudopeziza Ribis Kleb.).

Infection may occur at any time during the entire vegetation period. The main damage from it - abundant abscission of leaves, which can begin at the end of July. This will lead to crop loss next year. Spots can also occur on young shoots, leaf stalks, stems and berries.

Anthracnose countermeasures:

  1. To stop the development of the disease, in the fall, remove from the site and destroy the affected leaves, because anthracnose fungi inhabit and hibernate on the leaves.
  2. Spray the buds before blooming with a solution of iron (300 g per 10 liters of water) or copper sulfate (50-100 g per 10 liters of water).
  3. During the growing season, spray with 1% Bordeaux liquid. Perform the first spraying at bud break, the second - immediately after flowering, the third - 10-15 days after the second and the last - after the harvest. It is important that the composition fell on both the outer and the inner side of the leaves.

If carrot-colored pads appeared on the underside of currant leaves, filled with a mass of spores in the form of bristles, and on top of the leaves, opposite these formations, red spots appeared - this indicates columnar rust currants (Cronartium ribicola Ribes). Later, all the leaves on the back side are almost completely covered with an orange "brush" spore and begin to fall prematurely, and the shoots dry out and look underdeveloped.

Measures to combat columnar rust:

  1. In order to stop the development of this disease, in the early spring cut the infected branches 5-10 cm below the site of the lesion. This will improve air circulation and prevent the spread of infection.
  2. In the autumn, scrape and remove all fallen leaves and loosen the soil near the bushes.
  3. Treat plants regularly with 1% Bordeaux liquid: in early spring (before bud break), after flowering and after harvest.

If you notice small brown tubercles surrounded by a yellow border on the upper side of the currant leaves, it means that the currant is sick leaf rust (Puccinia ribesii caricis). Over time, in place of the pads there are columns of yellow and red. Gradually the entire sheet is covered with fluffy rust.

Measures to combat leaf rust:

  1. Remove and burn both affected and fallen leaves. Do not send them to the compost pile - there disputes will be able to winter well.
  2. Spray the plants with 1% Bordeaux liquid. The first treatment is carried out during the blooming of the leaves, the second - with the appearance of buds and the third - immediately after flowering.
  3. At the first signs of the disease treat bushes Fitosporin-M.

If on the leaves or sprouts of a currant or gooseberry you have found medium-sized roundish pale grayish spots with a dark brown border, and on them are black, randomly scattered dots (pycnidia), know that askokhitoz (Ascochyta). Over time, the affected areas of the leaves dry up, crack and fall out.

Measures to combat ascohitosis:

  1. Collect and destroy crop residues, weed out and prevent thickening of currant plantings. To do this, regularly carry out sanitary and anti-aging pruning.
  2. Disinfect the planting material in a solution of copper sulfate (100 g per 10 l of water) for 5 minutes, followed by washing the seedlings in clean water.
  3. Observe agricultural practices - loosen the soil near the shrubs, make the necessary fertilizers and do not forget about watering the plants.

If a white mealy bloom appeared on the leaves of the currant, which eventually becomes rusty in color, know that powdery mildew (Erysiphaceae). The disease can occur during the entire growing season. Often the edges of the leaves turn brown and black. Severe infection slows the growth of shoots and adversely affects the yield of the next year.

Powdery mildew control measures:

  1. Reduce the frequency of watering - powdery mildew is actively manifested in excessive moisture.
  2. Spray using a solution of soda ash (5 g soda, 50 g green soap, diluted in 10 liters of water). Treatment is carried out immediately after flowering or after the appearance of the first symptoms of the disease 2-3 times per season with an interval of 10-15 days.
  3. Take 1 part of rotted manure and fill with 3 parts of water. Let it brew for three days. Ready infusion dilute with water in a ratio of 1: 2, strain and spray the affected bushes.

If you notice that the currant leaves are small and dark green, and consist of 3 blades - this is double leaves or reversion (Ribes virus) currants. The veins of the leaves grow coarser, and sometimes chlorosis appears on young leaves, which subsequently disappears. Calyx, corolla, stamens of a flower look like petals of violet color. In this case, the berries are formed ugly or not tied at all, the bushes become abnormally thickened with signs of growth (like witch panicles).

Measures to combat terry:

  1. Reversion is practically not amenable to treatment with available drugs and remedies.
  2. For the prevention of the disease, it is necessary to fight with the kidney mite and constantly inspect the freshly planted bushes, especially during the first 4 years after disembarkation.
  3. Damaged and diseased bushes are the easiest to root out and destroy.

If you find rounded diffuse pale yellow spots with a light green center on the leaves of red currant, located between large veins, and you see that the leaf plate is growing unevenly - it means the plant is affected mosaic (Mosaica). Over time, the spots merge, the sheet turns completely yellow, the affected tissue between the veins becomes white and dries.

Mosaic control measures:

  1. Use healthy planting material. Absolutely mosaic-resistant varieties of currants do not exist, so it is important that the bushes from which you take cuttings are healthy.
  2. For prevention, treat the area from sucking insects.
  3. Uproot and burn damaged bushes and do not plant currants in the old place for the next 5 years.

If the leaves cover small, up to 2-3 mm in diameter, spots of angular shape, first brown, then white with a brown border - this indicates septoria, or white spot (Septoria), currant leaves.

Measures to combat septoria infection:

  1. First of all, observe the agrotechnical rules of tillage, namely, in early spring or late autumn, dig it up, remove or bury the leaves, and destroy weeds.
  2. Regularly add to the soil zinc, copper, manganese, boron, zinc sulphate, so that the plant grows healthy and strong.
  3. Prevent thickening of the landings, ensure free air circulation and prevent the formation of dampness. To do this, timely conduct sanitary pruning shrubs.

As you can see, your concern about the variegated color of the leaves of the currant, most likely, justified. There are several dozen varieties of currants in the list of diseases; therefore, it is especially important to detect signs of infection in the early stages in order to start treatment in a timely manner.

Watch the video: How to Prune Blackcurrant Bushes (February 2020).