Currant black disease care. Red currant disease photo. Diseases of the red currant: prevention is required

Consider the disease of currant with a photo for clarity in the following sequence .

Fungal disease affecting all types of currants. The fungus, which had winterized on the shoots and plant residues, is activated in spring at 12–16 degrees. On the sheet plates appear yellowish-green spots with a diameter of 2.5-3mm, which gradually become brown in color. Then the spots merge and the sheet looks burned. He begins to twist up the edges and falls. For this reason, the lower part of the bush becomes bare, and brown ulcerations appear on the bare shoots.

Spores of the fungus are carried by wind and insects. The rapid spread of the disease contributes to high humidity. If control measures were not taken in a timely manner, in August, currant bushes can completely lose all the leaves. This leads to a premature growth of axillary buds, weakening of the shoots and a decrease in yield in the next season, provided that the weakened bush suffers winter. Anthracnose destroys currant bush for 3-4 years.

How to deal with anthracnose.

Spray currants with 3% Bordeaux mixture until the buds swell. After flowering, treat with 1% Bordeaux mixture. After collecting the berries, process the currant with copper oxychloride. Abandoned leaves, heavily damaged shoots to collect and burn. The soil under the bushes abundantly sprinkle with wood ash.

American Powdery Mildew

Fungal disease, mainly affecting black currants, at least - red and white. The disease can occur in late spring (the last decade of May or early June). The underside of the sheet is covered with a friable, whitish bloom, while the upper part of the sheet brightens - the first alarm.

In warm and humid weather, the fungus captures all the young parts of the bush, down to the green berries. White felt mycelium tightens the leaves on both sides, petioles and shoots. The leaves become corrugated and shallow, the internodes on the shoots are shortened and dry. Berries fall off, not only not ripening, but sometimes even not having time to pour. Mealy dew on currants overwinter on the affected parts (leaves from the tops of the young shoots do not fall off).

How to deal with powdery mildew on currants.

After flowering, every ten days spray currants and soil under the bushes with one of the solutions: 10 liters of water + blue vitriol 20g + household soap 150g; 10 liters of water + soda ash 50g + household soap 50g; 10 liters of water + 3 kg of wood ash to insist day, strain and spray. You can use fungicides such as Skor CE or Rayok CE. Cut damaged shoots and burn together with fallen leaves.

Septoriosis white currant spot

Fungal disease. Characterized by the appearance on the leaves of angular, yellowish-brown specks with a diameter of 2-3mm. gradually the edges of the spots become brown, and the center turns white. On a white background from the top side of the leaf dots of black color appear - fruit bodies with spores. The shoots are covered with elongated spots, and the berries are small flat spots of brown color. Septoriosis can lead to the complete fall of the foliage at the end of summer.

How to deal with white spot on currants.

Actions are similar to anti-anthracnose.

Pillar rust on currants

Fungal disease. Most common in areas close to which grow coniferous trees (especially Siberian cedar and pine). From the middle of summer the leaves are covered with small yellowish spots, and from the bottom side with small pads of bright orange color. Gradually brown spores sprout from pads. In the fall, the currant bush is covered with such a rusty “fringe”, the leaves fall prematurely. Shoots do not ripen, reduced winter hardiness and future harvest.

How to deal with columnar rust on currants.

Glass rust on currants

Fungal disease caused by fungus, wintered on sedge. In late spring or in the first decade of June, orange pads appear on any parts of the bush (leaves, shoots, flowers, etc.). The disease leads to abscission of leaves, flowers or ovaries.

How to deal with the goblet rust on the currants.

Measures are the same as in the fight against columnar rust. If sedge grows near your site, be sure to mow it with a radius of up to 500m.

Currant is a real medicine for humans. In its fruits and leaves a huge amount of all sorts of nutrients: vitamins (E and C, as well as many others), trace elements, acids and sugars, various biologically active compounds.

Due to its valuable composition, it is popular among fans. folk treatment, but she herself can get sick. At the same time massive outbreaks of disease can completely deprive you of the harvest. Therefore, it is worth taking the precautionary measures very seriously and knowing in advance what you may encounter.

Currant Diseases

Almost all the main diseases in currants cause fungi, such as:

• anthracnose (vague small dark brownish spots of irregular shape appear on the leaves, then the leaves turn brown in color, twist and fall, the growth of shoots and yield) decrease;
• sphere library or American powdery mildew (affects young shoots, leaves, ovaries and berries, which are covered with a powdery white patina, thickening and taking on the appearance of dark brown felt, in the future all parts of the plant dry out);

• doubleness or reversion (the causative agent of the disease is found in the sap of the plant, it affects the whole bush, changing the shape and color of the flowers and leaves);
• septoria or white spot (the leaves are affected by numerous grayish spots with a dark brown border, on which later black spots of the fungus with spores are formed, then the leaves curl and fall off);
• scaly rust (orange specks with yellow spore pads appear on the leaves, later they turn into pimples in the form of goblets).

Currant Pests

In addition to fungal diseases, currants are subject to attack from various pests, the main of which are:

• currant leaf gall midge (small mosquitoes that feed on young leaves that do not unfold, disfiguring them);
• currant goldfish (the larva of the beetle feeds on the core of the branches, the tops of the shoots begin to dry up);
• currant bud mite (mites inhabit the buds on plants, causing them to die);
• spider mite (it covers the leaves with a spider web and sucks the juice out of them, the leaves turn yellow and die);
• currant kidney moth (damages both the kidneys and berries, the buds do not bloom and die);
• gooseberry fry (butterfly lays eggs into flowers, caterpillars emerge from them, which entangle the web and feed on the fruits);

• pale-legged gooseberry sawfly (green larvae eat all the leaves, only the veins are left);
• yellow gooseberry sawfly (green-blue with black dots larvae eat the leaves);
• gooseberry moth (caterpillars eat the whole leaf, leaving only the petiole);
• currant glass bowl (pink or white caterpillars gnaw through the core of the branches, shoots dry out and die);
• gooseberry sprout aphid (sucks the juice from the ends of the shoots and from the leaves, which roll up into a ball);
• leaf gall aphid (the aphid feeds on the underside of the leaves, on the upper part blisters of red color are formed).

After reviewing the external signs of diseases and pests of currants, it is easy to find photos on the Internet and more accurately determine which enemy you are facing.

Currant Pests and Disease Control Measures

Having found the signs of the disease with anthracnose or Septorioz, it is necessary to spray with blue vitriol or copper chloroxide in a dilution of 10 liters of water - 40 g of the drug.

In the fight against the goblet rust, a 1% solution of Bordeaux mixture is used: the first time when the leaves bloom, the second after flowering, and the third after 8-10 days.

The destruction of a sphere library consists in spraying bushes and soil with iron sulphate at 10 liters of water - 300 g of the preparation. At the first signs of illness, during the growing season, the bushes are sprayed with soda ash (50 g of soda per 10 liters of water) with 50 g of soap added. Processing is repeated 2 or 3 times in 10 days.

Terry or reversion is a fairly common and dangerous disease of black currant. In this case, the plant becomes fruitless, and pruning and other methods are powerless. If you notice that during the flowering period the flowers of the currant completely dry out, do not fall for a long time and the fruit does not form - you need to uproot and burn the diseased shrub. Terry is transferred from one plant to another by a kidney mite, aphids, as well as the cultivation of already infected shoots.

For pest control there are special solutions for spraying, which can be bought in the store.

Currant disease prevention

The precautions, a kind of prevention include the following actions:

• digging the land around the plants;
• destruction of fallen leaves;
• pruning.

Many diseases can be avoided by proper care  behind bushes: in case of lack of moisture, currants lose their greenery, turn yellow, berries fall off, and with an excess of moisture root rot develops.

The lack of light leads to the fact that the berries ripen poorly and fall off, and an excess of light contributes to leaf burns.

Using a healthy, disease resistant planting material, it is possible to avoid the defeat of currants by pests and diseases.

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Diseases of the red currant: prevention is required

  The most common diseases of the red currant are: anthracnose, powdery American dew, septoria. Consider them in more detail.

This berry bush is most affected by the fungus pseudopetsitsitsa. The peak of this disease of red currant, called anthracnose, falls in the middle or end of the summer season. The disease is caused by a violation of the physiological functions of the plant, resulting in the inhibition of its development and, as a result, a decrease in yield in the coming year. From this disease, red currants mainly affect leaves, occasionally cuttings or berries. On the affected areas appear very small, the size of one millimeter, brown spots, which later turn black. With a strong defeat, the bush reduces its growth by a third, and the harvest by half.

  The degree of disease of this garden crop with anthracnose depends not only on the weather, the variety and age of the plant, but also on the contamination of the area where the red currant grows. Diseases (photos are usually depicted almost bare plants) are expressed in the drying of the leaves and their premature shedding. Most often this can be observed when moisture stagnates, as well as in wet and cool weather, because fungal spores are spread by means of rainwater. Fight with anthracnose need spraying. The ideal medicine is a one-percent solution of Bordeaux liquid.

The causative agent of such a disease of red currant, as Septoria, is the organism ribis Desme. On the leaves of the garden crop, round or angular spots are formed, initially brown and then whitening. Brown streaks form along the edges of the lesions. Leaves dry and fall off.

Agrotechnical and chemical measures to combat septoria are the same as with anthracnose. The microorganism Morsuwe can be a cause of red currant disease, called the American powdery mildew. The disease covers not only the foliage of a garden bush, but also its stalks, shoots, buds and, of course, berries. First, symptoms of the disease are observed on the apical shoots. The underside of their leaves along the veins in the lateral lobes is covered with a mealy white bloom, which gradually turns into a dense felt layer with brown color. The degree of damage to the bush depends on the weather, varietal characteristics and infestation of the site. From this disease of red currant its winter hardiness decreases sharply. In addition, the leaves become ugly, twisted. A mild winter with an abundance of snow contributes to the spread of American powdery mildew, creating a greenhouse effect. With a thick planting of this disease, red currants can kill almost all other berries, such as gooseberries or raspberries.

Agricultural technicians recommend periodic prevention of this disease, feeding garden crops with nitrogen fertilizers. Of the chemical agents used to combat American dew, a solution of soda ash and soap is most suitable. It is necessary to spray twice with an interval of ten days approximately fifteen or twenty days before the beginning of the harvest.

The fight against red currant diseases should include their preliminary prevention.

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Currant Diseases | HitAgro.RU

Diseases currant photo

Hello! In the article currant diseaseswe will consider with you all the main currant disease with photos  and a detailed description of them and find out how to deal with currant diseases. As we know, diseases of currants deprive us of the harvest. For example, anthracnose flashes in wet years cause a loss of 75% of the crop and a decrease in it in the coming year. With the defeat of plants with terry losses can range from 30% to 100%. Therefore, the agrotechnical method should be basic in protecting plants from diseases and pests. If a site for planting a healthy planting material is chosen correctly, the most resistant varieties are selected and a high agrotechnology for the care of soil and plants is maintained, the number of pests and diseases is significantly reduced.

American powdery mildew of currant (sphere library)

The causative agent of the disease fungus, affects mainly black currants, to a lesser extent is a threat to white and red currants. Young parts of plants suffer: petioles, leaves, shoots, green berries.

The fungal bodies of the fungus overwinter on the shoots and not fallen leaves. The first signs of a lesion can be seen at the end of May - early June. At this time, on the underside of the leaves, a white, loose deposit appears, consisting of chains of spores. They are easily carried by wind, insects, rain, infecting the young growing organs of the bush throughout the summer.

First, on the upper side of the leaf at the site of the lesion, tissue lightening is noticeable. Under favorable weather conditions (temperature 16-18o, relative humidity of 70-80%) 2 weeks after the appearance of these first signs, the disease covers all young leaves, petioles and the tip of the shoot.

With the strong development of American powdery mildew, the leaf is covered on both sides with a continuous felt of a white mycelium. The affected parts of the plants dry up, the leaves become corrugated, small, the internodes of the shoots are shortened. Old, severely affected leaves fall, the young remain to winter on the affected tops of the shoots. Affected green berries in currants fall, not ripening.

In mid-July and early August, fungal bodies of the fungus form on the mycelium, remaining to spend the winter on non-fallen leaves and shoots. In the spring, they are the primary source of infection. Fruit bodies wintering on fallen leaves, as a rule, die. The source of infection in the spring can be a mycelium, which has been preserved on living parts of plants.

Control measures . Cutting and burning damaged tops in the fall. Cleaning the leaves or digging the soil under the bushes with the incorporation of fallen leaves into the soil. Planting powdery mildew resistant varieties of currants (Berezovka, Necklace, Pygmy, Vigorous). Spraying of plants and soil under them immediately after flowering 2-3 times with an interval of 7-10 days and immediately after harvest infusion of ash (3 kg per 10 liters), soda ash and soap (50 g soda + 50 g soap 10 l ), soap-copper emulsion (150 g of soap + 20 g of copper sulphate and 10 liters of water).

White spot of currant leaves (Septoria)

The disease strongly affects black currants and gooseberries, and to a lesser extent, red currants. Manifests a disease on the leaves, the stems. On the leaves, at first, small red-brown round or angular spots are formed, then they turn white in the center, and a brown border is clearly visible on the edges.

During the summer, the disease is spread by fungal spores. It reaches its maximum development in the middle of summer. The development of the disease contribute to the high temperature and relative humidity of the air, thickened planting. Mushroom overwinter on affected shoots and stems.

Septoria infection causes mass drying of currant leaves and their premature abscission. Patients shoots give poor growth and small berries. Especially strongly the disease develops in wet years and in thickened plantings.

Measures to combat the disease.

Planting only healthy planting material from the nursery.

Destruction of fallen leaves in early spring or autumn.

Digging the soil under bushes in autumn or early spring.

Timely thinning thickened plantings.

Spraying with nitrophene solutions (200 r per 10 l of water) in early spring. During the growing season can be processed 1% bordeaux mixture: before flowering and after picking berries, if necessary after flowering.

Introduction of micronutrients containing zinc, copper, manganese, boron into the soil at the rate of 6 g per 10 square meters simultaneously with mineral fertilizers.

Currant Disease Anthracnose

Anthracnose (fly sniper)currants are widely distributed throughout the Soviet Union. This fungal disease is expressed in the appearance of very small brown spots on the leaves (conidial sporification of the fungus). The leaf tissue turns brown, the leaf dries and falls prematurely. Anthracnose also affects leaf stalks, young shoots, stalks. Strong development of anthracnose reaches in the 2nd half of summer (end of July - August). Mature leaves are distinguished by a particularly high density and intensity of infection.

In the leaves of the fungus penetrates mainly from the bottom.

Less affected by anthracnose varieties of black currant Dove, Primorsky champion, Zoya, Cox, Minay Shmyrev, Belarusian Sweet, Seedling Dove. Varieties of Elegant, Exhibition, Fertile Lia are moderately and weakly affected, but in some years they can be severely affected. The old Neapolitan variety is very strongly affected by anthracnose. Due to the strong disease of anthracnose, this variety often has weak bushes and low yields. Variety Bredthorp is usually weakly affected, but in some years - in the middle degree.

Red currant is very sensitive to anthracnose. The leaves of many unstable varieties fall off even in the presence of several spots on them, until the berries are fully ripe. Especially strongly affected varieties of the Red Cross, fertile Feya. More resistant to anthracnose varieties - the descendants of the currant rocky and red: Dutch red, Pervenets, Victoria, Varshevicha, Yuterbogskaya.

Currant varieties strongly affected by anthracnose have a low winter hardiness.

How to deal with this disease.  Early in spring or autumn after the leaves fall, they are sprayed with a 3% solution of 60% nitrafen (30-40 kg / ha, bushes and soil under the bushes). In summer, a 0.4% suspension of 80% cuprozan (3-4 kg / ha) and 1% colloidal sulfur (3-4 kg / ha) are used. Sprayed before flowering, then after flowering and 10-12 days later, the fourth time sprayed after picking berries, while necessarily processing the underside of the leaf. Also use 1% Bordeaux liquid. Agrotechnical measures for protection against diseases are reduced to the collection and destruction of fallen leaves, timely digging and tilling the soil under bushes, embedding the upper layer to a depth of 10 cm, regular destruction of weeds, thinning thickened plantings.

Terry (reversion) of blackcurrant

This disease causes currant sterility. The causative agent of the disease is transmitted from the diseased plant to a healthy kidney mite with the juice of the diseased plant, aphids, and also with planting material, if cuttings are taken from diseased bushes.

The disease manifests itself during flowering in the deformation of leaves, flowers, shoots. The leaves of the affected plants are three-lobed (instead of five-lobed), elongated, with pointed ends; the teeth are large, sparse at the edges. The number of veins is reduced, the leaf blade thickens, the specific smell of currants is lost, the leaf color is darker than in healthy plants. The calyx, corolla and stamens become filiform, elongated, purple (in some varieties green) and are located below the ovary (in a healthy flower, they are located above the ovary). The flowers wither and do not fall off for a very long time. Berry is not formed. Flowering of diseased buds starts 5-7 days later than in healthy ones. In a bush, one or several branches can be infected, and only with a very strong lesion all branches are infected. As a rule, infection with terry increases over the years. Depending on the number of affected branches in the bush, the yield loss can be from 20 to 100%. Resistant varieties  there is no disease.

Control measures . Use healthy planting material. Cuttings should be taken only from healthy bushes, where for 3 years no symptoms of the disease were found. It is necessary to inspect the planting of currants at the end of flowering; If any infected flowers are detected, the bush should be completely uprooted and burned. Separate affected branches are cut out only at the initial stage of their infection, but this does not guarantee the deliverance of the bush from the disease.

Currant rind

Disease control measures  the same as with anthracnose. A radical means of struggle - the destruction of sedge.

Currant Pillar Rust

It affects the leaves of black currant. Pathogen mushroom wintering on fallen leaves. At the beginning of the harvest, small yellowish spots appear on the upper side of the leaves, on the lower side, in the places of the spots small bright orange pads. In the future, instead of pads, orange is formed first, then brownish columns of spores, similar to the hairs of the brush. By autumn, the infected leaves are completely brushed with spores. Heavily affected leaves fall prematurely, the shoots in this case do not mature well, their winter hardiness decreases, and the harvest is lost next year.

Columnar rust develops very strongly on currants, near which weymouth pine or Siberian cedar grow intermediate hosts of the disease. Primary infection occurs in the spring of spores, wintering on fallen leaves.

Control measures.   Planting currants away from coniferous forests. Autumn collection and destruction of fallen leaves or their careful incorporation into the soil. Threefold spraying Bordeaux mixture: in early spring, before bud break; after flowering and after harvest. Good care of plants (top dressing, watering and introduction of phosphorus-potash fertilizers in the fall).

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Currant diseases and pests

Currant diseases and control measures

Currant anthracnose.  The disease affects the leaves of black currant and gooseberry, and the red currant - leaf petioles, stems and fruits. Anthracnose develops in early May. At first, small brown spots appear on the leaves with edges that are colored darker. Gradually, they increase in size and merge together. The affected leaves turn yellow, curl upwards and fall prematurely, the shoots are stunted and do not mature.

Control measures.

In the fight against anthracnose, digging the soil in late autumn and early spring around bushes with the incorporation of dead diseased leaves is important.

Of the currant chemicals, positive results are obtained by spraying before blooming the kidneys with a solution of ferrous or copper sulfate (respectively, 300, 50-100 grams per 10 liters of water). During the growing season, four-percent spraying of one percent is carried out. bordeaux liquid. It is important that the liquid hit the top and bottom sides of the sheet. The first spraying is carried out at bud break, the second - immediately after flowering, the third - 10-15 days after the second, and the fourth - after the harvest is removed.

Rust.  Common currant disease in the country. On the underside of the sheet appear orange spots - pads. During the period of exacerbation of the disease, the leaves fall, the bushes are weakened, the harvest is reduced.

Control measures.

You should not plant currants in places where sedge is growing, and thicken the bushes when planting. The plot is kept clean of weeds. In autumn, the soil is deeply dug up, embedding autumn leaves in it. In addition, the bushes are sprayed with a solution of iron or copper sulphate, as well as Bordeaux mixture, as in the fight against anthracnose.

Leaf spot.  Fungal disease affects the leaves of currants and gooseberries. Appears on them in the form of grayish rounded or angular spots with a dark brown border and black dots in the center.
  Control measures. Same as against anthracnose.

Terry  A viral disease that spreads very quickly. Carrier disease are currant bud mite, aphids, bedbugs. When the disease is changed by the terry, the shape and color of the flowers changes. The leaves of diseased plants also change. The blades of the leaf become narrow, pointed, the teeth greatly increase and stand out sharply on the leaf plate. The flowers become purple in color and become terry. Sepals and stamens turn into petals. Leaves from five-lobed become three-lobed. Currant bushes infected with terry does not bear fruit. The disease is carried with planting material.

Control measures.

For laying new plantings of currant used only healthy planting material. Branches afflicted with terry cut, and sometimes remove, the bushes entirely. In addition, be sure to fight kidney mite.

Pests:

Sheet gall aphid.  It affects all kinds of currants. Yellow-red convex galls are formed on the upper side of the leaves.

Currant glass bowl.  Its larva makes moves in the inner part of the branches of black currant, which it feeds on. It winters in paved moves.

Currant gallitsa. Its larva damages, strongly deforms or completely dries young leaves at the tops, on the main branches and forks.

Kidney tick.  Destroys flower buds and is a carrier of the most dangerous viral disease - reversion.

Ways of struggle:

Branches and branches affected by the glass and kidney mites are cut and burned, repeating the operation in 15-20 days.
  After the leaves fall, they are buried or collected and burned - against anthracnose, septoria, gall midges, etc.
  Winter spraying with a 1.5% solution of dinosol is performed - against all diseases.

With the mass appearance of gall midges in the second half of March, the soil surface under the bushes is sprinkled with 2.8 percent lindane at the rate of 3 g / m2.
  After flowering, spray with a 0.1% solution of basezol, a 0.1% solution of karatan or a 0.8% solution of thiosol (if the plants are not damaged by powdery mildew, you can replace with a 0.3% solution of perocine) in combination with a 0.3% with chlorophos solution, 0.12% dipterex solution or with another insecticide - against anthracnose, septoria, powdery mildew, glass case, gall midge, etc. Against a kidney tick, a 0.2% milbola solution, a 0-2% tionex solution .