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What is missing from raspberries? What the leaves indicate: lack of nitrogen, phosphorus, potassium. Raspberry leaves have red veins.

Wiring
18.04.2024

When growing raspberries in a summer cottage one has to face various kinds of difficulties. The most important misfortune for shrubs is infection with one or another disease. The plant begins to wither, the leaves fall off and the quality of the berries deteriorates. In the future, the bush may die completely and infect neighboring plants.

Raspberry diseases are divided into two types: infectious and non-infectious. Infectious diseases include those varieties that are spread by various bacteria or fungal spores. They are normally treatable at the initial stage, but in the future the development of the disease reduces the chances of recovery significantly; in the advanced stage, it is no longer possible to cure raspberries, so the bush is uprooted from the ground - there will be no more benefit from it. Non-infectious diseases are caused by a lack of vitamins in the soil, or improper care or planting. Difficulties in treating non-communicable diseases arise when identifying a specific cause. Sometimes it takes more than a week to recognize the cause of raspberry wilting, as a result of which the bush may already lose all its strength to recover, so you need to act immediately.

Fungal infections

When a shrub is infected, the fungus quickly penetrates through cuttings, stems, and cracks directly into the plant tissue. Fungal infections are spread by insects, but they can predominate in the soil when growing a previously diseased plant.

Important! Most fungal infections begin to affect raspberries in the spring - in April or May.

Fungal diseases include the following types:

  • Didimella. Otherwise the disease is called Purple Spot. The causative agent of the disease is believed to be a fungus called Didymella applanata. The fungus spreads very quickly along young annual shoots and stems, forming heterogeneous spots of a vague shape. Over time, the spots become brown, and pathogens appear in the center in the form of small red spots. The fungus causes berries to spoil and stems to die. A measure to combat the fungus is cutting out infected shoots. You can treat with fungicides of the Abiga-Pik, Alirin B, Gamair brands.

  • Anthracnose. The disease spreads rapidly due to the progression of the fungus Gloeosporium venetum Speg. Small red spots immediately appear on the affected leaves and shoots, with the middle colored gray and the edges colored red. After a few days, the leaves begin to curl into a tube, and then dry out and die. The berries die immediately; infected fruits are unsuitable for food. Rainy weather, frequent watering, and high humidity have a positive effect on the reproduction of the fungus. In addition to pruning infected shoots, spraying with a 1% solution of copper sulfate is effective in combating the disease. A 3% solution of nitrafen and 4% Bordeaux mixture helps prevent the spread of fungus. All solutions are applied to healthy shoots; diseased bushes are immediately removed.

  • Septoria. Young shoots and green leaves become the affected area of ​​the fungus. The disease appears in early summer. Round brown spots form on the leaves, with black dots forming in the center. The spot dries, leaving holes in the leaves, and then the leaf itself dies. The only effective remedy for septoria is pruning the diseased bush. The infection cannot be treated, and infected shoots will not return to normal. To prevent the spread of fungal spores to neighboring raspberry branches, they are sprayed with a solution of copper sulfate or zineb.

  • Verticillium wilt. The disease is spread by a soil fungus that affects most agricultural crops. The fungus can overwinter in the soil and is not afraid of frost. The incubation period can last a very long time, even if the plant has survived spring and early summer well, the first signs of infection will not appear until July, when the weather becomes hot and dry. Wilting is manifested by the appearance of yellow dry spots on the leaves. The leaf dies after a while, and soon the shoot itself dies. The use of fungicides will help prevent the spread of the disease.

  • Rust. One of the most common raspberry diseases is caused by the fungal spore Phragmidium. The disease progresses intensively with the formation of rusty spots on the leaves and then on the stem. The leaves dry out, begin to curl, and then die. New shoots also die. The disease can only be eradicated by removing infected shoots and further burning them. To prevent the remaining raspberry shoots from becoming infected, they are treated with any solution containing copper or zinc.

  • Gray rot. The disease is manifested by the formation of a gray coating on the leaves. Black bumps form on the plaque. The coating then spreads throughout the raspberries, including the berries. To prevent infection of healthy shoots, fungicides such as Fitosporin-M are used. Healthy bushes should be sprayed at least once a week. Diseased shoots are cut off and burned.

Viral diseases

Viruses enter raspberries with insects or through contaminated soil. Treatment is difficult, but the bush can be saved. Viruses multiply quickly and spread to healthy shoots. One of the radical and effective measures against viral infections was and remains pruning the diseased parts. Viral diseases include:

  • Mosaic. This disease occurs frequently. The main symptom is the appearance of tubercles on the leaves and the formation of rough spots. All spots are separated by a vein, so the leaf resembles a mosaic. The seedlings instantly wither and lose viability. The mosaic quickly affects the berries, forming inclusions on them. The virus spreads well in conditions of high humidity. The main way to combat mosaic is the use of insecticides, since the disease is mainly transmitted by insects. There is no such cure for mosaic, only trimming the infected part of the raspberry can stop it.

  • Dwarfism. The raspberry virus becomes infected in August or September. The disease may not manifest itself in any way, since the virus calmly survives the winter, already in the raspberries, and will only appear in the next summer. The main symptom is thinning of the shoots. Young shoots noticeably slow down in growth rate, new branches become brittle. Raspberries stop bearing fruit or produce small, unsightly fruits; during flowering, deformation and irregular, mutated shape of flowers may occur. The disease is difficult to recognize, since there are no obvious signs of its manifestation. Nevertheless, herbal decoctions of yarrow and chamomile are considered effective means for treatment; you can spray raspberries with infusion of potato tops.

  • Vein chlorosis. The main carrier of chlorosis is called aphids. The disease is similar to mosaic, so it is often misdiagnosed. A symptom of infection is the appearance of yellow, dry spots on the leaves. A net appears on the spots. The leaf vein changes color - it becomes yellow. Today, an effective measure for treating chlorosis is pruning infected shoots.

Healthy shoots continue to be treated with solutions of Bordeaux mixture and insecticides.

  • Curly. The disease becomes noticeable when the shoots reach two years of age. The shoots are short, and the leaves are highly wrinkled and stiff. Leaves may become curled at the edges. The fruit cluster becomes unattractively shaped and the berries grow poorly. The shoots of young root shoots are too thick. The curl progresses for 3-4 years, after which the raspberry bush dies out. The disease cannot be treated because it requires too difficult a diagnosis and the symptoms are mild.

Non-infectious diseases of raspberries

Non-communicable diseases are much more common than viruses and fungi. You can recognize such a disease by observing the bush for some time. The main symptoms of the disease are:

  • yellowing of sheets;
  • scanty or late fruiting;
  • poor formation of new shoots;
  • the formation of brittle and thin new shoots.

Such symptoms arise as a result of gardeners making mistakes when planting and caring for raspberries. Raspberries should be planted at a distance of at least 50-60 centimeters from neighboring crops in neutral soil. Additives for raspberries are used 3-4 times a season. It is allowed to fertilize with special complex compounds. For abundant fruiting and flowering, potassium and phosphorus fertilizers are used. To form new healthy shoots and leaves, ammonium nitrate is added to the soil. Using the right fertilizers and regular watering will eliminate the above symptoms while preserving the bush.


Prevention and folk remedies

To avoid having to deal with diseases, follow the following recommendations:

  • carry out regular weeding of raspberries from weeds and shoots;
  • In the fall, the soil must be dug up;
  • Water the bush regularly, but do not overdo it;
  • cut off old and dried shoots in a timely manner at least 2 times a year;
  • in the autumn and spring, healthy shoots are irrigated with Bordeaux mixture or copper sulfate.

Carrying out these measures will minimize the risk of infection with viruses and various fungal infections.

Important! Prevention of diseases and pests of raspberries is carried out in the spring.

Folk remedies for disease prevention are still used today. Raspberries are often sprayed with infusion of potato tops. To obtain an infusion, 1 kilogram of tops is poured into a bucket of water and left for a day, then the mixture is filtered and 50 grams of grated laundry soap are added. The mixture effectively repels insects - the main carriers of infection.


A tincture of garlic or onion has a similar effect. 4 heads of onion or garlic are finely chopped and poured with 10 liters of water. Leave the solution for 3-4 days, and then irrigate the raspberry shoots once a week in the spring. Raspberries react well to herbal products such as chamomile and yarrow. They do not harm the bush; on the contrary, they promote lush flowering and abundant fruiting. The standard preparations for treating raspberries in the spring have become a solution of potassium permanganate and Bordeaux mixture, as well as dissolved copper sulfate.

All processing must be carried out in a timely manner, even in the first year of growing raspberries. Although special care for raspberries is not required, the condition of the leaves and stem is constantly monitored, and attention is paid to the shoots formed - they should be healthy in appearance and have a beautiful red-brown color. The color of raspberry leaves is green; the formation of spots or cracks is not allowed. If the first signs of damage to the bush are noticed, the cause is determined and dealt with using the methods described above.

A change in foliage color usually indicates that the crop is experiencing some kind of discomfort. Although raspberries are not one of the fastidious plants, they also need timely help. Otherwise, neither the plant nor the harvest will be able to be saved.

Why

The reasons for the appearance of light green foliage on raspberry shoots are usually divided into harmless and dangerous:

Non-dangerous reasons for the appearance of light green leaves on raspberries:

  • Lack of light

The main function of the leaf is photosynthesis, during which plant cells receive the substances necessary for growth and development. This process requires the sun. If the leaves become lighter in the lower, most dense and shaded parts of the plant, the reason for this is a lack of sunlight.

  • Aging and natural death

The light green leaves gradually turn yellow, dry out and die. This is a common process when it comes to the lower, older leaves. Typically, natural dying begins to occur in the second half of summer.

  • Nutrient deficiencies

Raspberries are demanding when it comes to organic matter. If it is not enough, this is expressed in a change in the color of the leaves from rich green to light, turning into yellow. Typically, the upper, growing leaves suffer from nutrient deficiency. The lower ones retain their original color.

  • No moisture

Raspberries love water, and therefore during periods of drought they need regular watering. This is especially true for the period of flowering, setting and development of berries. In total, at least 8 abundant waterings are made per season. During watering, it is necessary to saturate the area where the roots of the plant are located, so a lot of water is required, at least 1 bucket for each bush.

  • Excess moisture

Excess moisture, as well as its lack, has a detrimental effect on raspberry bushes. In case of prolonged stagnation of water in the root area, chlorosis of all green parts of the raspberry is observed. At the same time, the plant begins to lose color, much fewer berries are formed, they become small, watery, and with a reduced sugar content.

Dangerous reasons for the appearance of light green leaves on raspberries:

  • Chlorosis

This disease progresses in leaves in which the process of synthesis of chlorophyll, the coloring pigment, is disrupted. Outside, there is a lightening of the foliage, with further yellowing. At the same time, the veins retain their color. After complete yellowing, the leaves turn brown and die. The process usually affects the upper shoots of raspberries.

In spring or summer, a change in the color of raspberry foliage to light green indicates the presence of this disease.

Chlorosis can be infectious or non-infectious. The latter is often caused by a lack of certain minerals in the soil, for example, iron, manganese, zinc, sulfur or magnesium. It also happens that minerals in the soil are contained in a form that is inaccessible to plants for absorption. This also provokes the development of the disease.

Non-infectious chlorosis also appears on plants suffering from severe soil acidification. It is known that raspberries are sensitive to acidity levels, and therefore deacidification measures should be carried out regularly.

Infectious chlorosis of raspberry leaves is caused by viruses or fungi, carried by pests, primarily aphids and mites. In addition, the disease can be brought to an area with poor-quality planting material.

If the foliage turns light green due to infectious chlorosis, it is better to remove such raspberry bushes and burn them outside the site. Treating the area with modern fungicides will help prevent new outbreaks of the disease.

  • Root cancer

In some cases, the cause of light green raspberry leaves may be cancer of the root system. The presence of this disease can be judged only after digging up an infected bush. Its rhizomes acquire a characteristic goiter. Because of this, they cease to cope with their main task - the delivery of nutrients. Raspberries first change the color of the leaves and then quickly die.

Since the causative agent of the disease is bacteria, the affected bushes are not treated, but destroyed in order to avoid further spread of the disease.

What to do

The lack of light is eliminated by thinning the plant by spring or autumn pruning. If this is not enough, the raspberries will have to be transplanted to a sunnier area.

Old foliage should be torn off so that the plant stops wasting energy on it. If there are a large number of old leaves, it is better to rejuvenate and feed the planting.

The lack of organic matter can be solved by adding chicken manure or any green fertilizer. Mulching with rotted manure with mandatory abundant watering will also help. It will also protect the crop from unwanted evaporation of moisture during drought.

Non-infectious chlorosis is treated by adding minerals, which raspberries are deficient in. If the disease is caused by severe acidification of the soil, adding lime, dolomite flour or wood ash will help solve the problem. The deficiency of a particular substance can be judged by the color of the foliage. If the leaves have become light green, there is a lack of iron; if the leaves are yellow and their size has decreased, there is a lack of nitrogen; if the leaf lightening is visible between the veins at the base of the shoot, then the raspberry does not have enough manganese.

Iron deficiency is treated with iron chelate fertilizer (spraying on the leaf) or a homemade version.

Recipe for a folk remedy for iron deficiency in raspberries:

Ingredients:

  • boiled water, 3 l.;
  • citric acid, 1 tablespoon;
  • iron sulfate, 1 teaspoon.

Preparation: dissolve in 3 liters. water, citric acid and iron sulfate, spray raspberries with the resulting product in the evening, when there is no wind, at the rate of 1 liter. for 5 m2 of raspberry fields. The solution must be used within 1-2 hours after preparation and cannot be stored. Don’t forget about the “old-fashioned” method of enriching the soil with iron - burying cans and old rusty nails in the soil next to the raspberry bushes.

If there is a lack of manganese, the raspberries are sprayed with a 2% solution of manganese chelate.

Infectious chlorosis is treated by eliminating infected plants and further treating the area with fungicides.

As a preventive measure and to control pests that are the main carriers of infectious chlorosis, the drug Inta-Vir can be used. One tablet is diluted in 10 liters. of water, the resulting solution is used to process raspberries one leaf at a time at the rate of 1.5 liters. funds per 10 m2.

To prevent the spread of infectious chlorosis throughout the raspberry tree, treat pruners, knives and other cutting garden tools with a 1% manganese solution when moving from infected to uninfected areas.

Root cancer is easier to prevent than to treat. Therefore, you should water raspberries in a timely manner, apply fertilizers, observe crop rotation and buy raspberry seedlings from conscientious sellers. As a rule, gardeners introduce the cancer bacterium into the area with seed.

Light green raspberry leaves may be evidence of a serious disease or may be the result of agricultural errors. Such a plant requires supervision, separate care, and in extreme cases, removal from the site.

People who grow raspberry bushes often experience reddening of the foliage. This problem is very dangerous because it can cause plants to dry out. Therefore, it is necessary to figure out in advance why raspberry leaves turn red in June and what to do about it.

There are several reasons why bright red spots appear on the surface of the foliage.

Phosphorus deficiency

Phosphorus is considered the main nutritional component needed for the development of raspberry bushes. The lack of this component negatively affects the fruiting and flowering of seedlings. The first signs of phosphorus deficiency appear in the spring, when buds should appear on the stems of the bushes. In plants that lack phosphorus fertilizers, buds appear with a delay.

Phosphorus deficiency is also indicated by the fact that seedlings' flowers and buds fall off.

The leaf blades are covered with dark spots with a red tint. Gradually, all affected foliage becomes deformed and begins to dry out. Only phosphorus-containing fertilizer mixtures can save plants.

Fungal diseases

Another reason why raspberry leaves turn red and dry is the development of fungal diseases. Common diseases caused by fungus include:

  • Anthracnose. A common pathology that affects not only raspberries, but also other garden crops. Signs of the disease appear on foliage, berries, buds and stems. To promptly identify anthracnose, it is necessary to inspect the leaves. Small reddish dots appear on them, the size of which gradually increases.
  • Septoria. A disease that most often appears on raspberry bushes. At first, the lower leaves become covered with red spots, but then the bush begins to dry out.
  • Verticillium. This is a dangerous disease, due to which the yield is reduced by 2-3 times. Symptoms of verticillium include drying of leaves and cracking of stems.

Insect pests

The reasons for the development of red spot include pest attacks on seedlings. There are several insects that often appear on raspberry bushes:

  • Gall midge. This is a small yellowish mosquito that damages the foliage and stems of garden crops. Reddish dots form on damaged areas of plants. If the gall midge is not eliminated in time, it will damage more than 80% of the shoots.
  • Nutcracker. When this pest damages the leaves, reddish swellings appear on their surface. Damaged foliage cracks and dries out.
  • Aphid. The most common pest that appears on all garden and garden crops. First, aphids damage inflorescences and young shoots. However, gradually the number of pests increases throughout the bush.

What to do to get rid of redness?

To get rid of red spots on the surface of leaves, you need to use the following means:

  • "Inta-Vir". The product is used if spotting is caused by pests. Inta-Vir contains components that help destroy pests in 2-3 sprayings. You can use the drug no more than twice a week.
  • "Fitoverm". A universal drug used to treat fungal diseases and eliminate insects. Shrubs are sprayed with Fitoverm three times a month.
  • "Aktara". To get rid of insect pests, it is enough to treat the plant with Aktara once.

How to prevent the problem?

To ensure that redness never appears on the leaves, you need to learn how to prevent this problem. Raspberry bushes are less likely to get sick if you protect their roots from mechanical damage. Also, to prevent the development of diseases, you need to regularly feed the bushes with organic matter and mineral fertilizers. Fertilizers are added 4-5 times per season.

In addition, the following preventive measures must be observed:

  • regular spraying of raspberries with fungicides;
  • replanting bushes to a new location every 5-7 years;
  • Periodically prune to remove weakened or diseased shoots.

Conclusion

Gardeners who grow raspberries in the garden sometimes encounter redness of the upper and lower leaves. To eliminate red spots, you need to become familiar with the causes of their appearance and effective treatments.

The condition of berry crops is of great importance for a real gardener. Leaves, roots, stem - everything must be in perfect condition, because only in this case can you get healthy, large berries in sufficient quantities, as well as healthy offspring of seedlings, if necessary. Raspberries are one of the most beloved crops, and today almost any owner of a country plot has them. The fact is that caring for raspberries throughout the entire fruiting season is very simple, which means that even the busiest gardeners will be able to enjoy the tasty and sweet berries of this crop by the end of summer. Reddening raspberry leaves can appear in several cases, and it is better to familiarize yourself with each in more detail.

Causes of red raspberry leaves

The most common ones include the following:

  1. Lack of phosphorus. Phosphorus is one of the most necessary elements, without which not only the growth of shoots is disrupted, but also the buds, which in turn are the source of the formation of berries. In this case, you can observe a change in the color of the leaves, which first turn red and then acquire a purple tint.
  2. Fungal diseases. Often, red raspberry leaves are the result of the activity of fungi that can settle on the stem. For example, a raspberry bush infected with anthracnose fungus may first surprise the gardener with red and then blackening leaves. It is necessary to carefully examine the entire shoot, not excluding the root zone, to identify the presence of the causative agent of the disease. If there are other defects, such as cracks and spots on the stem and leaves, then we can safely state the presence of fungus on the raspberries.
  3. Pests. Most often, they settle directly on the stem, causing it to begin to swell. Their active activity also worsens the condition of the crop, and reddening leaves are one of the signs that may indicate pests have settled on raspberries.

Control measures

Pests must be controlled with the help of biological preparations - such as Fitoverm or Akarin. Many chemicals can kill not only pests, but also other insects that are beneficial in the biological chain, such as earthworms. Finally, biologics contain virtually no toxins. The active components of the drugs are absorbed within about 3 hours, and then for another 3 weeks they firmly maintain protection and guard the health of the raspberry bush.

Fungal diseases must be combated with special drugs. One of the best is considered to be the “Zircon” product. Purple stem spot is a fungal disease that causes leaves to turn red and dry out. In this case, it is necessary to select dry leaves affected by the fungus and throw them away from the place where the raspberry bushes grow, because the spores can travel several meters. The bush must be treated with Zircon immediately after the crop is harvested. This must be done in early spring, as well as spraying young buds in June-July. If everything is done correctly, then you can completely improve the health of the culture.

Finally, phosphorus deficiency can only be dealt with in one way - by applying mineral fertilizers with a high content of this mineral. It is better to do this in a diluted form. In general, a lack of phosphorus is typical for poor forest lands, and therefore an experienced gardener will always try to prevent the situation rather than deal with the consequences.

Many gardeners complain that at the beginning of summer, raspberries have yellowing leaves. This mainly happens during the ripening period of the berries. First, the leaves of the plant begin to wither, and then the stems dry out along with the fruits. It is important to solve the problem in time to save the harvest. There are several leaves of the raspberry. Depending on the type of disease, a specific method of combating the virus should be used.

Gardeners often attribute the deterioration of plants to summer drought or lack of nutrients. Of course, there may also be such reasons, but if there is a lack of moisture, the raspberries wither, the leaves burn, but do not turn yellow or fall off. Some craftsmen suggest spraying diseased bushes with potassium permanganate, but this strong oxidizing agent is unlikely to help, and the soil contains a sufficient amount of manganese.

If the raspberry leaves first turn yellow, the new stems grow short, and then the bush dies altogether, then the plant suffers from root canker. In this case, all that remains is to uproot all the plantings and not plant berry crops in this place for about 15 years. The reason why raspberry leaves turn yellow may be more harmless. For example, in the middle of summer it dries out due to overly dense plantings. Poor aeration and illumination negatively affects the condition of plants.

A virus such as wilt is dangerous for raspberries. A sign is the gradual withering of the shoots along with the berries, which acquire a lilac-bluish color. Nightshade crops are considered to be a reservoir of the virus; for this reason, potatoes and tomatoes should not be planted near raspberries. The disease progresses especially quickly on waterlogged soils. Another reason why raspberry leaves turn yellow may be poor care of the plantings. The soil needs to be dug up and fertilized every year. Compost and humus can be used as fertilizer.

A fairly common disease is purple spotting or didimella. Many gardeners wonder why raspberry leaves turn yellow in the spring, not suggesting that it is infected with a fungus. In mid-June, red-violet spots appear on young shoots, which eventually grow and cover the entire bush. In autumn, most of the shoots die off, and the remaining shoots survive the winter very poorly. The disease develops due to rainy and warm springs, as well as winters with frequent thaws.

If the answer to the question of why raspberry leaves turn yellow has been found, you need to start combating the problem. First of all, you need to buy only proven and healthy planting material. It is recommended to choose varieties that are resistant to the virus, such as Skromnitsa, Novost Kuzmina, Balsam, Scarlet Sail, Bryanskaya. You should trim the bushes in a timely manner and tie them to a trellis for ventilation. All spotted shoots should be pruned without delay. During the period of bud break, the growth of young shoots, before flowering and after fruiting, raspberries can be sprayed with 1% boron liquid. Such methods of combating the virus will help stop the development of the disease and save plants from death.